Tony Z. Qiu

TL;DR: The impact of technologies, especially intelligent transportation system (ITS) technologies, on transportation research during the last several decades is summarized and general characteristics of the next generations of transportation models are proposed and discussed to provide a vision regarding expected future achievements in transportation research.

TL;DR: This paper proposes a method to estimate freeway traffic density with both loop detector data and IntelliDrive-based probe vehicle data, and has been validated with Berkeley Highway Laboratory loop detectorData combined with field-collected probe vehicleData in the first validation study and next-generation simulation video trajectory data in the second validation test.

TL;DR: In this article, an analytical model was developed to represent drivers' response to updated speed limits and macroscopic speed dynamical change with respect to changeable speed limits, where the fundamental diagram was replaced with the VSL control variable in the relaxation term of the METANET.

TL;DR: It is found that the electric vehicle (EV) range, the charging speed, and the vehicle supply have a significant impact on the ACEV-based car-sharing system.

TL;DR: In this paper, a model predictive variable speed limit (VSL) control strategy was proposed and evaluated to evaluate its safety and mobility impacts. And the strategy uses second-order traffic flow models to predict the traffic state and to provide a speed for optimizing corridor operational performance.