TRB 2004 Annual Meeting CD-ROM Paper revised from original submittal. 2 ABSTRACT Simulation modeling is an increasingly popular and effective tool for analyzing transportation problems that are not amendable to study by other means. For any simulation study, model calibration is a crucial step to obtaining any results from analysis. This paper presents a… (More)
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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… (More)
Recent advances in vehicle-based surveillance technologies using Global Positioning Systems (GPS) promise high accuracy traffic information; however, their performance in field is insufficient yet mostly due to the lack of the number of probe vehicles. Meantime, the most prevailing traffic surveillance system in the world is the conventional inductive loop… (More)
Over the past decades, the fast growth in travel has increased traffic congestion, which in turn has increased vehicular emissions significantly. It is difficult to accurately estimate and quantify emissions with current practice because of its reliance on transportation planning models that are based on steady state hourly averages and thus are incapable… (More)
The authors propose a real-time adaptive signal control model that aims to maintain the adaptive functionality of actuated controllers while improving the performance of traffic-actuated control systems. In this model, a flow-prediction algorithm is formulated to estimate the future vehicle arrival flow for each signal phase at the target intersection on… (More)