@article{cunningham_schroeder_vaughan_hughes_2011, title={Is ticketing aggressive cars and trucks effective in changing driver behavior? Evidence from North Carolina}, number={2265}, journal={Transportation Research Record}, author={Cunningham, C. M. and Schroeder, B. J. and Vaughan, C. and Hughes, R. G.}, year={2011}, pages={100–108} }
 @article{schroeder_rouphail_hughes_2009, title={Working concept of accessibility performance measures for usability of crosswalks by pedestrians with vision impairments}, number={2140}, journal={Transportation Research Record}, author={Schroeder, B. J. and Rouphail, N. M. and Hughes, R. G.}, year={2009}, pages={103–110} }
 @article{schroeder_rouphail_hughes_2008, title={Toward roundabout accessibility - Exploring the operational impact of pedestrian signalization options at modern roundabouts}, volume={134}, DOI={10.1061/(ASCE)0733-947X(2008)134:6(262)}, abstractNote={This paper explores the use of pedestrian signalization options for crosswalks at one- and two-lane roundabouts to enable these facilities to be accessible to pedestrians with vision impairments. Motivated by uncertainties about the safety of roundabouts for blind pedestrians, audible pedestrian signals hold promise for safely regulating the interaction of vehicles and pedestrians at these facilities. However, the use of pedestrian signals at roundabouts is controversial because of the potential for queue spillback into the circulating lane and delays to vehicular traffic. The objective of this work is to quantify pedestrian-induced delays and queuing impacts of a pedestrian signal placed at the busiest approach of a modern roundabout. The analysis is performed using a calibrated microsimulation model and includes assessment of innovative solutions for crossing geometry and phasing scheme at one-lane and two-lane roundabouts. The results suggest that the impact of pedestrian signals at roundabouts is greatest as vehicle volumes approach capacity, but that vehicle delay and queuing can be mitigated through innovative signal configurations. The findings are important in light of recent discourse concerning the accessibility of roundabouts to pedestrians with vision impairments that may ultimately move towards a requirement for signalization for certain facility types.}, number={6}, journal={Journal of Transportation Engineering}, author={Schroeder, B. J. and Rouphail, N. M. and Hughes, R. G.}, year={2008}, pages={262–271} }
 @article{hughes_2005, title={Research agenda for the application of visualization to transportation systems}, volume={1937}, DOI={10.3141/1937-20}, abstractNote={Critical research needs associated with the effective application of visualization to transportation systems projects are identified. Visualization research needs are discussed within a broader, multidisciplinary context of technology development in the areas of simulation and modeling. Parallels are drawn between the current state of the practice in transportation as compared with that in the military–defense and aerospace areas. Some major differences between those areas and transportation systems development and user environments are noted, in particular (a) the current absence within the transportation community of a strong government research and development focal point for visual simulation and modeling and (b) the absence of an economic imperative similar to what prompted the defense community to embrace fully these technologies (i.e., fuel shortages, training system costs, and force readiness).}, journal={Human performance: Simulation and visualization}, author={Hughes, R.}, year={2005}, pages={145–151} }
 @inbook{hummer_rouphail_hughes_fain_toole_patten_schneider_monahan_do_2005, title={User perceptions of the quality of service on shared paths}, ISBN={0309094135}, number={1939}, booktitle={Bicycles and pedestrians:  Developing countries, 2005}, publisher={Washington, D.C.: Transportation Research Board}, author={Hummer, J. E. and Rouphail, N. and Hughes, R. G. and Fain, S. J. and Toole, J. L. and Patten, R. S. and Schneider, R. J. and Monahan, J. F. and Do, A.}, year={2005}, pages={28–36} }