| On-road measurement of vehicle tailpipe emissions using a portable instrument HC Frey, A Unal, NM Rouphail, JD Colyar Journal of the air & waste management association 53 (8), 992-1002, 2003 | 375 | 2003 |
| Fuel use and emissions comparisons for alternative routes, time of day, road grade, and vehicles based on in-use measurements HC Frey, K Zhang, NM Rouphail Environmental science & technology 42 (7), 2483-2489, 2008 | 304 | 2008 |
| A vehicle-specific power approach to speed-and facility-specific emissions estimates for diesel transit buses H Zhai, HC Frey, NM Rouphail Environmental science & technology 42 (21), 7985-7991, 2008 | 260 | 2008 |
| Comparing real-world fuel consumption for diesel-and hydrogen-fueled transit buses and implication for emissions HC Frey, NM Rouphail, H Zhai, TL Farias, GA Gonçalves Transportation Research Part D: Transport and Environment 12 (4), 281-291, 2007 | 243 | 2007 |
| Multimodal level of service for urban streets R Dowling, A Flannery, B Landis, T Petritsch, N Rouphail, P Ryus Transportation Research Record 2071 (1), 1-7, 2008 | 175 | 2008 |
| Comparative study of short-and long-term urban freeway work zones NM Rouphail, ZS Yang, J Fazio Transportation Research Record 1163, 4-14, 1988 | 172 | 1988 |
| Assessing methods for comparing emissions from gasoline and diesel light-duty vehicles based on microscale measurements MC Coelho, HC Frey, NM Rouphail, H Zhai, L Pelkmans Transportation Research Part D: Transport and Environment 14 (2), 91-99, 2009 | 168 | 2009 |
| Speed-and facility-specific emission estimates for on-road light-duty vehicles on the basis of real-world speed profiles HC Frey, NM Rouphail, H Zhai Transportation Research Record 1987 (1), 128-137, 2006 | 157 | 2006 |
| Effect of roundabout operations on pollutant emissions MC Coelho, TL Farias, NM Rouphail Transportation Research Part D: Transport and Environment 11 (5), 333-343, 2006 | 155 | 2006 |
| Estimation of delays at traffic signals for variable demand conditions R Akçelik, NM Rouphail Transportation Research Part B: Methodological 27 (2), 109-131, 1993 | 151 | 1993 |
| Impact of speed control traffic signals on pollutant emissions MC Coelho, TL Farias, NM Rouphail Transportation Research Part D: Transport and Environment 10 (4), 323-340, 2005 | 144 | 2005 |
| Integrating a simplified emission estimation model and mesoscopic dynamic traffic simulator to efficiently evaluate emission impacts of traffic management strategies X Zhou, S Tanvir, H Lei, J Taylor, B Liu, NM Rouphail, HC Frey Transportation Research Part D: Transport and Environment 37, 123-136, 2015 | 143 | 2015 |
| Event-based modeling of driver yielding behavior at unsignalized crosswalks BJ Schroeder, NM Rouphail Journal of transportation engineering 137 (7), 455-465, 2011 | 142 | 2011 |
| Operational analysis of uninterrupted bicycle facilities DP Allen, N Rouphail, JE Hummer, JS Milazzo Transportation Research Record 1636 (1), 29-36, 1998 | 142 | 1998 |
| Effect of arterial signalization and level of service on measured vehicle emissions A Unal, NM Rouphail, HC Frey Transportation Research Record 1842 (1), 47-56, 2003 | 138 | 2003 |
| Effect of pedestrians on capacity of signalized intersections JS Milazzo, NM Rouphail, JE Hummer, DP Allen Transportation Research Record 1646 (1), 37-46, 1998 | 135 | 1998 |
| Evaluation of numerical models for simulation of real-world hot-stabilized fuel consumption and emissions of gasoline light-duty vehicles CM Silva, TL Farias, HC Frey, NM Rouphail Transportation Research Part D: Transport and Environment 11 (5), 377-385, 2006 | 128 | 2006 |
| Method for investigating intradriver heterogeneity using vehicle trajectory data: A dynamic time warping approach J Taylor, X Zhou, NM Rouphail, RJ Porter Transportation Research Part B: Methodological 73, 59-80, 2015 | 126 | 2015 |
| Vehicle-specific emissions modeling based upon on-road measurements HC Frey, K Zhang, NM Rouphail Environmental science & technology 44 (9), 3594-3600, 2010 | 111 | 2010 |
| Traffic flow at signalized intersections N ROUPHAIL15, A TARKO16, J LI17 | 111 | 1992 |
H. Christopher FreyGlenn E. Futrell Distinguished University Professor of Environmental Engineering, North CarolinaVerified email at ncsu.edu