@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)}, 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}, 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} }