Billy M Williams

Works (65)

Updated: November 18th, 2024 16:40

2024 article

Response time of mixed platoons with traditional and autonomous vehicles in field trials: impact assessment on flow stability and safety

Das, T., Ahmed, I., Williams, B. M., & Rouphail, N. M. (2023, December 29). TRANSPORTMETRICA A-TRANSPORT SCIENCE, Vol. 12.

By: T. Das n, I. Ahmed* , B. Williams n  & N. Rouphail n 

author keywords: Response time; mixed traffic; traffic flow stability; rear-end crash risk; adaptive cruise control; manufacturer heterogeneity
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: January 16, 2024

2023 article

A Limited, Real-World Assessment of Key Autonomous Vehicle Car Following Models

2023 IEEE 26TH INTERNATIONAL CONFERENCE ON INTELLIGENT TRANSPORTATION SYSTEMS, ITSC, pp. 966–972.

By: T. Das n, S. Samandar*, N. Rouphail n  & B. Williams n 

UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: June 17, 2024

2021 journal article

Investigating the relationship between freeway rear-end crash rates and macroscopically modeled reaction time

TRANSPORTMETRICA A-TRANSPORT SCIENCE, 18(3), 1001–1024.

By: I. Ahmed n , B. Williams n , M. Samandar  n & G. Chun n

author keywords: Required reaction time; car-following; discontinuous traffic flow model; rear-end crashes; traffic stream stability
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: May 10, 2021

2020 journal article

Crash Classification by Congestion Type for Highways

Applied Sciences, 10(7), 2583.

By: T. Song*, S. Kim*, B. Williams n , N. Rouphail n  & G. List n 

author keywords: collision classification; recurrent and non-recurrent congestion; link speed data; traffic safety; advanced traffic management system
TL;DR: An easily implementable methodology that can classify all reported crashes in terms of the operational conditions under which each crash occurred is presented, which makes use of a novel scheme for distinguishing between recurrent and non-recurrent congestion. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID, Crossref
Added: July 6, 2020

2020 journal article

Drone Delivery of an Automated External Defibrillator

New England Journal of Medicine, 383(12), 1186–1188.

By: W. Rosamond *, A. Johnson *, B. Bogle *, E. Arnold n , C. Cunningham *, M. Picinich n, B. Williams n , J. Zègre-Hemsey *

Contributors: W. Rosamond *, A. Johnson *, B. Bogle *, E. Arnold n , C. Cunningham *, M. Picinich n, B. Williams n , J. Zègre-Hemsey *

MeSH headings : Aircraft; Defibrillators; Humans; Manikins; Out-of-Hospital Cardiac Arrest; Patient Simulation; Time-to-Treatment
TL;DR: Delivery of an AED by drone was compared with on-the-ground retrieval of a fixed-location AED for simulated out-of-hospital cardiac arrest in patients with life-threatening cardiac arrest. (via Semantic Scholar)
Source: ORCID
Added: October 3, 2020

2020 journal article

Impacts of Private Autonomous and Connected Vehicles on Transportation Network Demand in the Triangle Region, North Carolina

JOURNAL OF URBAN PLANNING AND DEVELOPMENT, 147(1).

By: M. Hasnat n , E. Bardaka n , M. Samandar  n, N. Rouphail n , G. List n  & B. Williams n 

Contributors: M. Hasnat n , E. Bardaka n , M. Samandar  n, N. Rouphail n , G. List n  & B. Williams n 

UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: February 1, 2021

2018 journal article

Application of a Discontinuous Form of Macroscopic Gazis-Herman-Rothery Model to Steady-State Freeway Traffic Stream Observations

TRANSPORTATION RESEARCH RECORD, 2672(20), 51–62.

By: I. Ahmed n , B. Williams n  & M. Samandar  n

Contributors: I. Ahmed n , B. Williams n  & M. Samandar  n

TL;DR: Three constraints justified by the Highway Capacity Manual were applied to fit the model so that the fitted parameters have reasonable and physically interpretable values, and two statistical performance measures verify that the proposed model is preferable to the HCM models both in terms of fit alone and when considering the tradeoff between fit and model complexity. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: June 4, 2019

2018 journal article

Data-driven approach for identifying spatiotemporally recurrent bottlenecks

IET INTELLIGENT TRANSPORT SYSTEMS, 12(8), 756–764.

By: T. Song *, B. Williams n  & N. Rouphail n 

Contributors: T. Song *, B. Williams n  & N. Rouphail n 

TL;DR: A data-driven approach for identifying recurrent bottlenecks is introduced, using probe vehicle speed reports, and the characteristics determined the recurrent bottleneck locations with a historical time span of bottleneck activation are revealed and tested. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: October 16, 2018

2018 journal article

Reliability Assessment Tool: Development and Prototype Testing

TRANSPORTATION RESEARCH RECORD, 2672(14), 29–38.

By: G. List n , N. Rouphail n , R. Smith  n & B. Williams n 

Contributors: G. List n , N. Rouphail n , R. Smith  n & B. Williams n 

TL;DR: A monitoring system that was developed to assess travel time reliability for observed operating conditions by utilizing traffic stream and non-transportation related data is presented. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: May 28, 2019

2018 journal article

Validation and Calibration of Freeway Reliability Methodology in the Highway Capacity Manual: Method and Case Studies

TRANSPORTATION RESEARCH RECORD, 2672(15), 93–104.

By: N. Karmakar n, S. Aghdashi n, N. Rouphail n  & B. Williams n 

Contributors: N. Karmakar n, S. Aghdashi n, N. Rouphail n  & B. Williams n 

TL;DR: Practical calibration and validation methods of the core and reliability analyses described in the Highway Capacity Manual are focused on to provide HCM users with guidance on collecting data for freeway reliability analysis as well as validating the reliability performance measures predictions of the HCM methodology. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: June 4, 2019

2018 journal article

Weigh Station Impact on Truck Travel Time Reliability: Results and Findings from a Field Study and a Simulation Experiment

TRANSPORTATION RESEARCH RECORD, 2672(9), 120–129.

By: M. Samandar  n, B. Williams n  & I. Ahmed n 

Contributors: M. Samandar  n, B. Williams n  & I. Ahmed n 

TL;DR: The model results indicate that WIM technology does increase travel time reliability and provides benefits to both trucking companies and enforcement agencies, and it was also found that increases in the proportion of WIM bypass result in increases in routeTravel time reliability. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: May 28, 2019

2017 article

Advances in travel time reliability monitoring and assessment

JOURNAL OF INTELLIGENT TRANSPORTATION SYSTEMS, Vol. 21, pp. 435–438.

By: G. List n  & B. Williams n 

Contributors: G. List n  & B. Williams n 

TL;DR: Reliability can be viewed from multiple perspectives, including that of an individual driver who makes a trip repeatedly from an origin to a destination and who desires consistency in the travel time experienced, and a shipper's perspective might be that of ensuring that packages arrive on-time more frequently than a targeted “acceptable” percentage of the time. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2017 book

Exploring Vehicle–Pedestrian Crash Severity Factors on the Basis of In-Car Black Box Recording Data

In Transportation Research Record (Vol. 2659, pp. 148–154).

By: T. Song *, J. So *, J. Lee * & B. Williams n 

Contributors: T. Song *, J. So *, J. Lee * & B. Williams n 

TL;DR: Video data recorded by an in-car black box provided direct crash observation, they were more reliable than the crash data, and video images and speed profiles retrieved from the black box were advantageous for safety studies, and new explanatory variables that affected injury severity were defined. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Source: ORCID
Added: March 31, 2023

2017 journal article

Performance in Takeover and Characteristics of Non-driving Related Tasks during Highly Automated Driving in Younger and Older Drivers

Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 61(1), 37–41.

By: H. Clark n, A. McLaughlin n , B. Williams n  & J. Feng  n

Contributors: H. Clark n, A. McLaughlin n , B. Williams n  & J. Feng  n

TL;DR: It is found that older drivers speed was negatively predicted by age while their response time to a notification was not predicted by any factor, and younger drivers showed a trend of positive relationship between age and average speed and the characteristics of the last task engagement. (via Semantic Scholar)
Sources: ORCID, Crossref, NC State University Libraries
Added: March 31, 2023

2017 journal article

Real-Time Prediction of Seasonal Heteroscedasticity in Vehicular Traffic Flow Series

IEEE Transactions on Intelligent Transportation Systems, 19(10), 3170–3180.

By: W. Huang *, W. Jia *, J. Guo *, B. Williams n , G. Shi*, Y. Wei *, J. Cao *

Contributors: W. Huang *, W. Jia *, J. Guo *, B. Williams n , G. Shi*, Y. Wei *, J. Cao *

TL;DR: An online seasonal adjustment factors plus adaptive Kalman filter (OSAF+AKF) approach is proposed in this paper to predict in real time the seasonal heteroscedasticity in traffic flow series and showed improved adaptability when traffic is highly volatile. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: NC State University Libraries, NC State University Libraries, ORCID
Added: October 19, 2018

2015 journal article

Dynamic Bandwidth Analysis for Coordinated Arterial Streets

JOURNAL OF INTELLIGENT TRANSPORTATION SYSTEMS, 20(3), 294–310.

By: S. Kim n, A. Hajbabaie* , B. Williams n  & N. Rouphail n 

Contributors: S. Kim n, A. Hajbabaie* , B. Williams n  & N. Rouphail n 

TL;DR: Detailed analysis at three arterial sites revealed that coordinated green phase time distributions are complex and multimodal and cannot be represented by a single-valued statistic, and dynamic bandwidth analysis confirmed that programmed green bandwidth consistently underestimates the size of the actual dynamic bandwidth. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 book

Dynamic traffic flow model for travel time estimation

In Transportation Research Record (Vol. 2526, pp. 70–78).

By: T. Yi * & B. Williams n 

Contributors: T. Yi * & B. Williams n 

TL;DR: A comparison of the estimated results and measurement errors shows the accuracy of the modified dynamic model for estimating the travel times of freeway links under transition and congestion traffic conditions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: ORCID
Added: March 31, 2023

2015 journal article

Dynamic traffic flow model for travel time estimation

Transportation Research Record, (2526), 70–78.

By: T. Yi & B. Williams 

Source: NC State University Libraries
Added: August 6, 2018

2014 journal article

Adaptive Kalman filter approach for stochastic short-term traffic flow rate prediction and uncertainty quantification

TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES, 43, 50–64.

By: J. Guo *, W. Huang * & B. Williams n 

Contributors: J. Guo *, W. Huang * & B. Williams n 

author keywords: Congestion; Intelligent transportation system; Short term traffic flow forecasting; SARIMA; GARCH; Adaptive Kalman filter
TL;DR: Empirical comparisons using real world traffic flow data aggregated at 15-min interval showed that the adaptive Kalman filter approach can generate workable level forecasts and prediction intervals and demonstrates improved adaptability when traffic is highly volatile. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2014 journal article

Erratum for “Modeling Seasonal Heteroscedasticity in Vehicular Traffic Condition Series Using a Seasonal Adjustment Approach” by Guogang Shi, Jianhua Guo, Wei Huang, and Billy M. Williams

Journal of Transportation Engineering, 140(9), 08014002.

By: G. Shi*, J. Guo *, W. Huang * & B. Williams n 

UN Sustainable Development Goal Categories
Sources: Crossref, NC State University Libraries
Added: December 21, 2020

2014 journal article

Modeling Seasonal Heteroscedasticity in Vehicular Traffic Condition Series Using a Seasonal Adjustment Approach

Journal of Transportation Engineering, 140(5), 04014012.

By: G. Shi*, J. Guo *, W. Huang * & B. Williams n 

Contributors: G. Shi*, J. Guo *, W. Huang * & B. Williams n 

author keywords: Seasonal effect; Heteroscedasticity modeling; Short-term traffic condition forecasting; Generalized autoregressive conditional heteroscedasticity (GARCH); Time series analysis; Seasonal autoregressive integrated moving average (SARIMA)
UN Sustainable Development Goal Categories
Sources: Crossref, NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2014 article

Modeling seasonal heteroscedasticity in vehicular traffic condition series using a seasonal adjustment approach (vol 140, 04014012, 2014)

Journal of Transportation Engineering, Vol. 140.

By: G. Shi, J. Guo, W. Huang & B. Williams 

Source: NC State University Libraries
Added: August 6, 2018

2014 journal article

Real time traffic flow outlier detection using short-term traffic conditional variance prediction

TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES, 50, 160–172.

By: J. Guo *, W. Huang * & B. Williams n 

Contributors: J. Guo *, W. Huang * & B. Williams n 

author keywords: Outlier detection; Intervention analysis; Traffic flow series; Short term traffic forecasting; SARIMA plus GARCH; Kalman filter
TL;DR: It was found that outliers can be detected using the proposed detection strategy and it was shown that the information contained in the outliers should be assimilated into the forecasting system to enhance its ability of adapting to the changing patterns of the traffic flow series. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2013 book

Development of an oversaturated speed-flow model based on the highway capacity manual

In Transportation Research Record (pp. 41–48).

By: Y. Xu, B. Williams n , N. Rouphail n  & R. Chase

Contributors: Y. Xu, B. Williams n , N. Rouphail n  & R. Chase

UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Source: ORCID
Added: March 31, 2023

2013 journal article

Development of an oversaturated speed-flow model based on the highway capacity manual

Transportation Research Record, (2395), 41–48.

By: Y. Xu, B. Williams , N. Rouphail  & R. Chase

Source: NC State University Libraries
Added: August 6, 2018

2013 journal article

Synthesizing Route Travel Time Distributions from Segment Travel Time Distributions

TRANSPORTATION RESEARCH RECORD, (2396), 71–81.

By: I. Isukapati n, G. List n , B. Williams n  & A. Karr *

Contributors: I. Isukapati n, G. List n , B. Williams n  & A. Karr *

TL;DR: The Kolmogorov–Smirnov tests show that travel times synthesized from the segment-specific data are statistically different only under highly congested conditions, and even then, the percentage differences in the distributions of the synthesized and actual travel times are small. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2012 journal article

Comparative Evaluation of Reported Speeds from Corresponding Fixed-Point and Probe-Based Detection Systems

TRANSPORTATION RESEARCH RECORD, (2308), 110–119.

By: R. Chase n, B. Williams n , N. Rouphail n  & S. Kim n

Contributors: R. Chase n, B. Williams n , N. Rouphail n  & S. Kim n

UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2012 book

Delay analysis of single-lane roundabout with a slip lane under varying exit types, experimental balanced traffic volumes, and pedestrians, using microsimulation

In Transportation Research Record (pp. 76–85).

By: M. Al-Ghandour, B. Schroeder  n, W. Rasdorf n & B. Williams n 

Contributors: M. Al-Ghandour, B. Schroeder  n, W. Rasdorf n & B. Williams n 

UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Source: ORCID
Added: March 31, 2023

2012 journal article

Delay analysis of single-lane roundabout with a slip lane under varying exit types, experimental balanced traffic volumes, and pedestrians, using microsimulation

Transportation Research Record, (2312), 76–85.

By: M. Al-Ghandour, B. Schroeder, W. Rasdorf & B. Williams 

Source: NC State University Libraries
Added: August 6, 2018

2012 journal article

Integrated Heteroscedasticity Test for Vehicular Traffic Condition Series

JOURNAL OF TRANSPORTATION ENGINEERING, 138(9), 1161–1170.

By: J. Guo *, W. Huang * & B. Williams n 

Contributors: J. Guo *, W. Huang * & B. Williams n 

author keywords: Heteroscedasticity; Short-term forecasting; Vehicular traffic series; Transformation; Stochastic time series modeling; GARCH; SARIMA
TL;DR: An integrated heteroscedasticity test, including an optimal transformation search and four statistical tests, is proposed in this study, which aims to lay the theoretical basis for traffic uncertainty-related studies. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2012 book

Temporal stability of freeway macroscopic traffic stream models

In Transportation Research Record (pp. 131–140).

By: C. Liu*, B. Williams n  & N. Rouphail n 

Contributors: C. Liu*, B. Williams n  & N. Rouphail n 

TL;DR: A method to investigate the issue of temporal stability of freeway macroscopic traffic stream models rigorously with 15 years of traffic data from the London Orbital Motorway is presented and implemented and parameters were found to be relatively stable over time and did not exhibit statistically significant seasonal correlation. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Source: ORCID
Added: March 31, 2023

2012 journal article

Temporal stability of freeway macroscopic traffic stream models

Transportation Research Record, (2315), 131–140.

By: C. Liu, B. Williams  & N. Rouphail 

Source: NC State University Libraries
Added: August 6, 2018

2012 journal article

‘Real-time road traffic forecasting using regime-switching space-time models and adaptive lasso’ by Y. Kamarianakis, W. Shen, and L. Wynter

Applied Stochastic Models in Business and Industry, 28(4), 319–321.

By: B. Williams n 

UN Sustainable Development Goal Categories
Sources: Crossref, ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2011 conference paper

Analysis of Single-Lane Roundabout Slip Lanes Using SIDRA

In I. L. Al-Qadi & S. Murrell (Eds.), T & DI Congress 2011 : integrated transportation and development for a better tomorrow : proceedings of the First Transportation and Development Institute Congress : March 13-16, 2011, Chicago, Illinois (pp. 1235–1244).

By: M. Al-Ghandour, W. Rasdorf n, B. Williams n  & B. Schroeder  n

Contributors: M. Al-Ghandour, W. Rasdorf n, B. Williams n  & B. Schroeder  n

Ed(s): I. Al-Qadi & S. Murrell

Event: First Transportation and Development Institute Congress at Chicago, IL on March 13-16, 2011

Sources: Crossref, NC State University Libraries, ORCID
Added: February 24, 2020

2011 journal article

Analyzing Operational Improvements as an Alternative to Traditional Highway Construction

Transportation Research Record, (2223), 18–25.

By: W. Kittelson, N. Rouphail n , B. Williams n  & X. Zhou *

Contributors: W. Kittelson, N. Rouphail n , B. Williams n  & X. Zhou *

UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Conflict Models for Single-Lane Roundabout Slip Lanes from Microsimulation Development and Validation

Transportation Research Record, (2236), 92–101.

By: M. Al-Ghandour, B. Schroeder n, B. Williams n  & W. Rasdorf n

Contributors: M. Al-Ghandour, B. Schroeder n, B. Williams n  & W. Rasdorf n

TL;DR: Five zone-based conflict prediction models were developed and confirmed that conflicts in the merge area were more frequent than in the roundabout approach area and that the installation of a free-flow slip lane exit type reduced overall conflict occurrence. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Development and evaluation of a constrained optimization model for traffic signal plan transition

Transportation Research Part C: Emerging Technologies, 20(1), 185–198.

By: J. Lee * & B. Williams n 

Contributors: J. Lee * & B. Williams n 

author keywords: Traffic control; Signal plan transition; Control optimization; Genetic algorithms
TL;DR: A non-linear mathematical model is presented that provides constrained delay minimization through incremental and simultaneous adjustments in offset and cycle length during plan transitions that showed measurable improvement in delay performance under a broad range of traffic and geometric conditions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: Crossref, ORCID, NC State University Libraries
Added: December 21, 2020

2011 article

Development and evaluation of a constrained optimization model for traffic signal plan transition

PAPERS SELECTED FOR THE 19TH INTERNATIONAL SYMPOSIUM ON TRANSPORTATION AND TRAFFIC THEORY, Vol. 17, pp. 490–508.

By: J. Lee * & B. Williams n 

Contributors: J. Lee * & B. Williams n 

author keywords: traffic control; signal plan transition; control optimization; genetic algorithms
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2011 journal article

Fundamental Insight into Signal Plan Transition Methods

JOURNAL OF TRANSPORTATION ENGINEERING-ASCE, 137(10), 676–686.

By: J. Lee  n & B. Williams n 

author keywords: Traffic signals; Simulation; Evaluation; Traffic analysis
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Incorporating Stochastic Road Capacity into Day-to-Day Traffic Simulation and Traveler Learning Framework Model Development and Case Study

Transportation Research Record, (2254), 112–121.

By: A. Jia n, X. Zhou *, M. Li *, N. Rouphail n  & B. Williams n 

Contributors: A. Jia n, X. Zhou *, M. Li *, N. Rouphail n  & B. Williams n 

TL;DR: A method to seamlessly incorporate stochastic capacity models at freeway bottlenecks and signalized intersections is presented and adaptive day-to-day traveler learning and route choice behavioral models under the travel time variability introduced by random capacity variations are developed. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

Identification and Calibration of Site-Specific Stochastic Freeway Breakdown and Queue Discharge

Transportation Research Record, (2188), 148–155.

By: A. Jia*, B. Williams n  & N. Rouphail* 

Contributors: A. Jia*, B. Williams n  & N. Rouphail* 

UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

Real-Time Short-Term Traffic Speed Level Forecasting and Uncertainty Quantification Using Layered Kalman Filters

Transportation Research Record, (2175), 28–37.

By: J. Guo * & B. Williams n 

Contributors: J. Guo * & B. Williams n 

TL;DR: Results based on real-world station-by-station traffic speed data showed that the proposed online algorithm can generate workable short-term traffic speed level forecasts and associated prediction confidence intervals. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2009 journal article

Modeling the Role of Transportation Information in Mitigating Major Capacity Reductions in a Regional Network

Transportation Research Record, (2138), 75–84.

By: H. Hu  n, B. Williams n , N. Rouphail n , A. Khattak * & X. Zhou *

Contributors: H. Hu  n, B. Williams n , N. Rouphail n , A. Khattak * & X. Zhou *

TL;DR: The case study demonstrated that the DYNASMART-P DTA tool is capable of providing reasonable evaluation results, including realistic estimates of the effectiveness of ATISs in mitigating the congestion caused by work zone activities. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2008 journal article

Improved flow-based travel time estimation method from point detector data for freeways

Journal of Transportation Engineering, 135(1), 26–36.

By: L. Vanajakshi  n, B. Williams n  & L. Rilett  n

TL;DR: The present study proposes several modifications to an existing traffic flow theory based model for travel time based on inductance loop detectors, which are one of the most widely used inputs to travel time estimation techniques. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2008 journal article

Traveler Information Delivery Mechanisms Impact on Consumer Behavior

Transportation Research Record, (2069), 77–84.

By: A. Khattak *, X. Pan *, B. Williams n , N. Rouphail n  & Y. Fan *

Contributors: A. Khattak *, X. Pan *, B. Williams n , N. Rouphail n  & Y. Fan *

TL;DR: This study answers two fundamental questions: whether accessing more information sources is associated with a higher likelihood of travel decision adjustments and which technologies are more likely to elicit substantive adjustments to routine travel. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2007 journal article

Adaptive seasonal time series models for forecasting short-term traffic flow

Transportation Research Record, (2024), 116–125.

By: S. Shekhar * & B. Williams n 

Contributors: S. Shekhar * & B. Williams n 

TL;DR: Results show that forecasts obtained from recursive adaptive filtering methods are comparable with those from maximum likelihood estimated models, and the adaptive methods deliver this performance at a significantly lower computational cost. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2007 journal article

Data collection time intervals for stochastic short-term traffic flow forecasting

Transportation Research Record, (2024), 18–26.

By: J. Guo *, B. Williams n  & B. Smith *

Contributors: J. Guo *, B. Williams n  & B. Smith *

TL;DR: This work serves as an important step toward establishing a short-term traffic condition forecasting framework that identifies appropriate forecasting approaches for candidate data collection time intervals based on the functional requirements of specific applications. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2007 journal article

Simulation and analysis of freeway lane reversal for coastal hurricane evacuation

Journal of Urban Planning and Development, 133(1), 61–72.

By: B. Williams n , A. Tagliaferri n, S. Meinhold  n, J. Hummer n & N. Rouphail n 

Contributors: B. Williams n , A. Tagliaferri n, S. Meinhold  n, J. Hummer n & N. Rouphail n 

UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2007 journal article

Trraffic management center use of incident detection algorithms: Findings of a nationwide survey

IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS, 8(2), 351–358.

By: B. Williams n  & A. Guin *

Contributors: B. Williams n  & A. Guin *

author keywords: decision support systems; detectors; intelligent systems; transportation
TL;DR: Analysis of the survey results provides an understanding of the reasons behind the limited implementation of AID algorithms and allows a direct comparison between the conventional incident detection methods and the AID technology on the basis of measured and/or perceived performance. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2006 journal article

Comprehensive Evaluation of Guardrail Delineation Systems

Public Works Management &Amp; Policy, 11(1), 49–62.

By: B. Williams n , A. Amekudzi*, D. Folds*, A. Zureick * & Y. Kim*

Contributors: B. Williams n , A. Amekudzi*, D. Folds*, A. Zureick * & Y. Kim*

Source: ORCID
Added: March 31, 2023

2006 journal article

Reasonable Speed Limits on Suburban Multilane Highways with Curbs

Transportation Research Record, (1969), 10–17.

By: J. Baek n, J. Hummer  n, B. Williams n  & C. Cunningham  n

Contributors: J. Baek n, J. Hummer  n, B. Williams n  & C. Cunningham  n

Source: ORCID
Added: March 31, 2023

2006 chapter

Reasonable speed limits on suburban multilane highways with curbs

In Highway safety: law enforcement; alcohol; driver training; safety planning and management; commercial vehicles; and motorcycles (pp. 10–17). Washington: Transportation Research Board Natl Research Council.

By: J. Baek, J. Hummer, B. Williams  & C. Cunningham

Source: NC State University Libraries
Added: August 6, 2018

2006 chapter

Reasonable speed limits on suburban multilane highways with curbs

In Highway Safety: Law Enforcement; Alcohol; Driver Training; Safety Planning and Management; Commercial Vehicles; and Motorcycles (pp. 10–17). http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000243925000002&KeyUID=WOS:000243925000002

By: J. Baek, J. Hummer, B. Williams , C. Cunningham & Trb

Contributors: J. Baek, J. Hummer, B. Williams , C. Cunningham & Trb

gateway.webofknowledge.com
Source: ORCID
Added: March 31, 2023

2006 journal article

The network kinematic waves model: A simplified approach to network traffic

JOURNAL OF INTELLIGENT TRANSPORTATION SYSTEMS, 10(1), 1–14.

By: D. Ni *, J. Leonard* & B. Williams n 

author keywords: macroscopic model; kinematic waves; freeway networks; traffic simulation; ITS
TL;DR: The original KWaves theory is reformulated and extended to address network traffic, and the N-KWaves model is proposed, which is best suited for modeling traffic operation in a regional freeway network and has a strong connection to Intelligent Transportation Systems. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2004 journal article

Systematic Approach for Validating Traffic Simulation Models

Transportation Research Record, 1876(1876), 20–31.

By: D. Ni *, J. Leonard, A. Guin * & B. Williams n 

Contributors: D. Ni *, J. Leonard II, A. Guin * & B. Williams n 

TL;DR: To achieve a higher level of confidence about model performance, a simultaneous statistical inference technique is proposed that tests both model accuracy and precision. (via Semantic Scholar)
Source: ORCID
Added: March 31, 2023

2004 chapter

Systematic approach for validating traffic simulation models

In Calibration and validation of simulation models 2004 (pp. 20–31). Washington, DC: Transportation Research Board.

By: D. Ni, J. Leonard, A. Guin & B. Williams 

Source: NC State University Libraries
Added: August 6, 2018

2004 chapter

Systematic approach for validating traffic simulation models

In Calibration and Validation of Simulation Models 2004 (pp. 20–31). http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000227334900003&KeyUID=WOS:000227334900003

By: D. Ni, J. Leonard, A. Guin, B. Williams  & Tbr

Contributors: D. Ni, J. Leonard, A. Guin, B. Williams  & Tbr

gateway.webofknowledge.com
Source: ORCID
Added: March 31, 2023

2003 journal article

Modeling and forecasting vehicular traffic flow as a seasonal ARIMA process: Theoretical basis and empirical results

Journal of Transportation Engineering, 129(6), 664–672.

By: B. Williams n  & L. Hoel*

TL;DR: The theoretical basis for modeling univariate traffic condition data streams as seasonal autoregressive integrated moving average processes as well as empirical results using actual intelligent transportation system data are presented and found to be consistent with the theoretical hypothesis. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2002 journal article

Comparison of parametric and nonparametric models for traffic flow forecasting

Transportation Research Part C: Emerging Technologies, 10(4), 303–321.

By: B. Smith *, B. Williams*  & R. Keith Oswald

Contributors: B. Smith *, B. Williams*  & R. Oswald*

TL;DR: This research effort seeks to examine the theoretical foundation of nonparametric regression and to answer the question of whether non parametric regression based on heuristically improved forecast generation methods approach the single interval traffic flow prediction performance of seasonal ARIMA models. (via Semantic Scholar)
Source: ORCID
Added: March 31, 2023

2002 journal article

Determining traffic stream impacts of radar detectors using microscopic simulation

Journal of Transportation Engineering, 129(1), 7–15.

By: M. Oliveira, B. Williams*  & J. Leonard*

TL;DR: The case study shows that the efficacy of using radar as a speed reduction strategy is a function of congestion and radar detector density, with the strategy being most effective for volumes levels between 200 and 1,400 vehicles per hour per lane. (via Semantic Scholar)
Source: ORCID
Added: March 31, 2023

2001 journal article

Multivariate Vehicular Traffic Flow Prediction: Evaluation of ARIMAX Modeling

Transportation Research Record, 1776(1776), 194–200.

By: B. Williams* 

Contributors: B. Williams* 

TL;DR: The results indicate that ARIMAX models provide improved forecast performance over univariate forecast models, but further research is needed to investigate model extensions and refinements to provide a generalizable, self-tuning multivariate forecasting model that is easily implemented and that effectively models varying upstream to downstream correlations. (via Semantic Scholar)
Source: ORCID
Added: March 31, 2023

2001 chapter

Multivariate vehicular traffic flow prediction - Evaluation of ARIMAX modeling

In Traffic Flow Theory and Highway Capacity 2001 (pp. 194–200). http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000176595900025&KeyUID=WOS:000176595900025

By: B. Williams  & Trb

Contributors: B. Williams  & Trb

gateway.webofknowledge.com
Source: ORCID
Added: March 31, 2023

1998 journal article

Freight planning requirements for interstate corridors

Transportation Quarterly, 52(2), 39–48. http://www.scopus.com/inward/record.url?eid=2-s2.0-0032021740&partnerID=MN8TOARS

By: B. Williams  & L. Hoel

Contributors: B. Williams  & L. Hoel

www.scopus.com
Source: ORCID
Added: March 31, 2023

1998 journal article

Urban Freeway Traffic Flow Prediction: Application of Seasonal Autoregressive Integrated Moving Average and Exponential Smoothing Models

Transportation Research Record, 1644(1644), 132–141.

By: B. Williams* , P. Durvasula* & D. Brown *

Contributors: B. Williams* , P. Durvasula* & D. Brown *

UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (OpenAlex)
Source: ORCID
Added: March 31, 2023

1998 chapter

Urban freeway traffic flow prediction - Application of seasonal autoregressive integrated moving average and exponential smoothing models

In Traffic Flow Theory (pp. 132–141). http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000082030300014&KeyUID=WOS:000082030300014

By: B. Williams , P. Durvasula, D. Brown & Nrc

Contributors: B. Williams , P. Durvasula, D. Brown & Nrc

gateway.webofknowledge.com
Source: ORCID
Added: March 31, 2023

Employment

Updated: May 8th, 2019 17:05

2018 - present

North Carolina State University Raleigh, NC, US
Director Institute for Transportation Research and Education

2015 - present

North Carolina State University Raleigh, NC, US
Professor Civil, Construction, and Environmental Engineering

2008 - 2015

North Carolina State University Raleigh, NC, US
Associate Professor Civil, Construction, and Environmental Engineering

2002 - 2008

North Carolina State University Raleigh, NC, US
Assistant Professor Civil, Construction, and Environmental Engineering

1999 - 2002

Georgia Institute of Technology Atlanta, GA, US
Assistant Professor School of Civil and Environmental Engineering

1988 - 1999

University of Virginia Charlottesville, VA, US
Post-doctoral Research Associate Civil and Environmental Engineering

1990 - 1995

Kimley-Horn and Associates, Inc. Raleigh, NC, US
Consulting Engineer Transportation Planning and Traffic Operations

1987 - 1988

United States Navy - Civil Engineer Corps Washington, DC, US
Assistant Staff Civil Engineer/Lieutenant Jr. Grade(O-2) and Lieutenant (O-3) Field Support Activity

1984 - 1986

United States Navy - Civil Engineer Corps Long Beach, CA, US
Assistant Resident Officer in Charge of Construction/Ensign(O-1) and Lieutenant Jr. Grade (O-2) Resident Officer in Charge of Construction

Education

Updated: May 8th, 2019 17:01

1995 - 1999

University of Virginia Charlottesville, VA, US
PhD Transportation Civil and Environmental Engineering

1988 - 1990

North Carolina State University Raleigh, NC, US
MCE Transportation Civil, Construction, and Environmental Engineering

1980 - 1984

North Carolina State University Raleigh, NC, US
BS Civil Engineering Civil, Construction, and Environmental Engineering

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