Automated Workzone Information Systems (AWIS) have been developed, and some of them have been deployed in the field. Several field operational test studies have been conducted in the past to evaluate system functionality and reliability. However, there were few studies evaluating the effectiveness of AWIS in reducing traffic delays, which is of high interest of transportation agencies. Unlike t...

Urban congestion is a serious and worsening national problem, one which is receiving increasing attention from transportation engineers, planners, and researchers, as well as other local, state, and national officials. Urban freeways, which carry nearly 30’% of all traffic in urban areas, are particularly affected by growing urban congestion. In 1983, about 557. of urban freeway travel during t...

In this paper, in order to describe complex network systems, we firstly propose a general modeling framework by combining a dynamic graph with hybrid automata and thus name it Dynamic Graph Hybrid Automata (DGHA). Then we apply this framework to model traffic flow over an urban freeway network by embedding the Cell Transmission Model (CTM) into the DGHA. With a modeling procedure, we adopt a du...

46 Under connected vehicle environment, vehicles are able to communicate and exchange detailed 47 information such as speed, acceleration, and position in real time. Such information is important 48 for improving traffic safety. In the meantime, it allows vehicles to collaborate with each other, 49 which may significantly improve traffic operations particularly at intersections and freeway 50 r...

Automatic freeway incident detection is an important component of advanced transportation management systems ~ATMS! that provides information for emergency relief and traffic control and management purposes. Earlier algorithms for freeway incident problems have produced less reliable results, especially in recurrent congestion and compression wave traffic conditions. This article presents a new...

This paper concerns the exploration of statistical modelling tools for the analysis of observational freeway ow data, and the development of empirical models to capture and predict short-term changes in tra c ow characteristics on sequences of links in a partially detectorised freeway network. A rst set of analyses explores regression models for minute-by-minute tra c ows, taking into account t...

As an efficient traffic control strategy to ameliorate freeway traffic congestion, ramp metering has been successfully applied in the US. However, the applicability and effectiveness of a ramp-metering strategy are required to be investigated during the preimplementation phase in order to ensure the success of the implementation. The use of traffic simulation models can provide a quick and cost...