Ishtiak Ahmed

Works (13)

Updated: April 4th, 2024 07:16

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: ORCID, Web Of Science, NC State University Libraries
Added: January 16, 2024

2023 article

Modeling Framework for Predicting Lane Change Intensity at Freeway Weaving Segments

Ahmed, I., Karr, A., Rouphail, N. M., & Chase, R. T. (2023, April 19). TRANSPORTATION RESEARCH RECORD, Vol. 4.

By: I. Ahmed n , A. Karr, N. Rouphail*  & R. Chase  n

author keywords: data and data science; statistical methods; modeling; operations; freeway operations; highway capacity and quality of service; freeways
UN Sustainable Development Goal Categories
Sources: ORCID, Web Of Science, NC State University Libraries
Added: April 20, 2023

2022 article

Characterizing lane changing behavior and identifying extreme lane changing traits

Ahmed, I., Karr, A. F., Rouphail, N. M., Chase, R. T., & Tanvir, S. (2022, April 24). TRANSPORTATION LETTERS-THE INTERNATIONAL JOURNAL OF TRANSPORTATION RESEARCH, Vol. 4.

By: I. Ahmed n , A. Karr, N. Rouphail n , R. Chase  n & S. Tanvir*

author keywords: Driver behavior; extreme lane change maneuver; passing; NGSIM; false lane changes; congestion level; lane change frequency; trajectory visualization
UN Sustainable Development Goal Categories
Sources: ORCID, Web Of Science, NC State University Libraries
Added: April 27, 2022

2021 article

Dynamically Collected Local Density using Low-Cost Lidar and its Application to Traffic Models

Avr, A., Tanvir, S., Rouphail, N. M., & Ahmed, I. (2021, May 6). TRANSPORTATION RESEARCH RECORD, Vol. 5.

By: A. Avr n, S. Tanvir*, N. Rouphail n  & I. Ahmed n 

UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 30, 2021

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, ORCID, NC State University Libraries
Added: May 10, 2021

2021 journal article

Mobility Assessment of Pedestrian and Bicycle Treatments at Complex Continuous Flow Intersections

JOURNAL OF TRANSPORTATION ENGINEERING PART A-SYSTEMS, 147(5).

By: I. Ahmed n , S. Warchol*, C. Cunningham n & N. Rouphail n 

author keywords: Continuous flow intersection; Displaced left turn; Alternative intersection; Pedestrian; Exclusive bicycle path; Stopped delay; Number of stops
TL;DR: This study evaluated the mobility performance of pedestrian-bicycle crossing alternatives at continuous flow intersections (CFIs) by comparing CFI crossing types with a standard intersecting pattern. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: ORCID, Web Of Science, NC State University Libraries
Added: June 23, 2021

2020 journal article

Modeling Framework for Capacity Analysis of Freeway Segments: Application to Ramp Weaves

TRANSPORTATION RESEARCH RECORD, 2674(1), 148–159.

By: D. Xu n, N. Rouphail n , B. Aghdashi n, I. Ahmed n  & L. Elefteriadou *

Contributors: D. Xu n, N. Rouphail n , B. Aghdashi n, I. Ahmed n  & L. Elefteriadou *

TL;DR: A new modeling framework for the analysis of freeway segments that distinguishes between congestion effects caused by high v/c ratios from turbulence caused by merging, diverging, and weaving traffic, thus greatly simplifying the model form and its extensibility to other freeway segment types. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: February 3, 2020

2020 journal article

Smart Infrastructure: A Vision for the Role of the Civil Engineering Profession in Smart Cities

Journal of Infrastructure Systems, 26(2), 03120001.

By: E. Berglund n , J. Monroe  n, I. Ahmed n , M. Noghabaei n , J. Do  n, J. Pesantez n , M. Khaksar Fasaee  n, E. Bardaka n  ...

Contributors: E. Berglund n , J. Monroe  n, I. Ahmed n , M. Noghabaei n , J. Do  n, J. Pesantez n , M. Khaksar Fasaee  n, E. Bardaka n  ...

UN Sustainable Development Goal Categories
Sources: ORCID, Crossref, NC State University Libraries
Added: April 8, 2020

2019 journal article

Characterizing Lane Changes via Digitized Infrastructure and Low-Cost GPS

TRANSPORTATION RESEARCH RECORD, 2673(8), 298–309.

By: I. Ahmed n , A. Karr *, N. Rouphail n , G. Chun n & S. Tanvir n

Contributors: I. Ahmed n , A. Karr *, N. Rouphail n , G. Chun n & S. Tanvir n

TL;DR: Analysis of naturalistic trajectory data revealed that ramp-to-freeway trips had the highest number of discretionary lane changes in excess of 1 lane change/vehicle, and excessive lane change rates were highest between the two middle freeway lanes. (via Semantic Scholar)
UN Sustainable Development Goal Categories
9. Industry, Innovation and Infrastructure (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: October 14, 2019

2019 journal article

Lane Change Rates at Freeway Weaving Sites: Trends in HCM6 and from NGSIM Trajectories

TRANSPORTATION RESEARCH RECORD, 2673(5), 627–636.

By: I. Ahmed n , D. Xu n, N. Rouphail n  & A. Karr *

Contributors: I. Ahmed n , D. Xu n, N. Rouphail n  & A. Karr *

TL;DR: Analysis of HCM6 lane change patterns at the NGSIM site revealed a tendency for early merging for freeway to ramp traffic and uniform merging for ramp to freeway traffic over the length of the weave, and a speed analysis showed that a higher frequency of discretionary lane changes yielded lower travel times for drivers executing them. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: July 15, 2019

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, ORCID, NC State University Libraries
Added: June 4, 2019

2018 journal article

Characteristics and Temporal Stability of Recurring Bottlenecks

TRANSPORTATION RESEARCH RECORD, 2672(42), 235–246.

By: I. Ahmed n , N. Rouphail n  & S. Tanvir n

Contributors: I. Ahmed n , N. Rouphail n  & S. Tanvir n

TL;DR: A systematic framework is developed for tracking and archiving the spatiotemporal changes in the recurring bottlenecks and the influence of a long-term work zone in the area and the effect of the rapid growth in traffic demand are revealed. (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, ORCID, NC State University Libraries
Added: May 28, 2019

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