In: Transportation Research Part C: Emerging Technologies, 77. S.257-274.  Mehr Recent years have seen a renewed interest in Variable Speed Limit (VSL) strategies, and their potential as a freeway metering mechanism or a homogenization scheme. This paper uses empirical data to examine both the macroscopic and microscopic effects Plus

In: Transportation Research Part C: Emerging Technologies, Volume 72, November 2016. S.109-129, ISSN 0968-090X. More This paper proposes an efficient signal control algorithm under the co-existence of conventional vehicles, connected vehicles and automated vehicles. Trajectories of the automated vehicles are modified to reduce delay and stops. Simulations show that both Plus

In: Journal of Advanced Transportation, 50 (4). S.406-420. PDF  More   An on-street parking maneuver often starts a temporary bottleneck, leading to additional delay endured by the following vehicles. If the maneuver occurs near a signalized intersection, the service rate of the intersection might be reduced. In this paper, a Plus

In: Transportation Research Part C: Emerging Technologies, 64. S.28-44. More The paper establishes the first real-time control algorithm for pre-signals. The algorithm combines multiple operation strategies at the intersection. It functions well with a wide range of input values and is robust to input errors. The real-time pre-signal minimizes person Plus

In: Accident Analysis & Prevention, 85. S.219-228.  Mehr One of the challenges in traffic safety analyses is the heterogeneous nature of safety data. The study suggests that latent class clustered regression approach is suitable for reducing heterogeneity and revealing important hidden relationships in traffic safety analyses.

In: Transportation Research part B: Methodological.  Mehr PDF The urban parking and traffic systems are essential components of the overall urban transportation structure. The interactions between them can be highly influential to their performance. Here, we propose a methodology to model macroscopically such interactions and evaluate their effects on Plus

In: Transportmetrica B: Transport Dynamics. DOI 10.1080/21680566.2015.1025892  Mehr The paper evaluates the trade-offs between loop detector data and floating car data for the real-time estimation of origin–destination matrices in small networks. Results are used to evaluate the trade-offs between loop detector coverage and the penetration rate of floating car Plus

In: Accident Analysis & Prevention, 72. S.330–340.  Mehr This study is based on a five-year national pedestrian safety dataset for Switzerland. It explores the application of a partial proportional odds (PPO) model to bridge the gap between conventional crash injury severity models. The study shows that PPO models Plus

Transportation Research Part C, 46. S.121-131. Mehr Information from connected vehicles, such as the position and speed of individual vehicles, can be used to optimize traffic operations. An algorithm for two one-way-streets is proposed to gain insights about the value (in terms of delay savings) of using connected Plus

Transportation Research Record. PDF   ECitation One of the major causes of bus delays in urban environments are signalized intersections. The use of a pre-signal has been proposed in order to utilize the full capacity of the main signal while still providing bus priority. The goal of this research Plus

Transportation Research Record, 2359, 1-9. Mehr Parking duration is an important element in reflecting the parking demand, very often a patrol survey is conducted to obtain the data. This paper introduces an analytical model to understand the effects of survey cost and other inputs on survey accuracy in a Plus