The objectives of this study were to examine: (1) the performance of automated work zone information system (AWIS); and (2) the volumes at which congestion began to occur. Studies were conducted at rural freeway work zones in Arkansas, where two lanes in a direction were reduced to one lane. The AWIS system in use had detectors spaced at one mile intervals; it correctly identified the presence of backups approximately 88% of the time. Congestion and slowdowns were found to occur at much lower volumes than reported in the literature, in some cases as low as 800 to 900 vehicles per hour. All of the observed backups were propagated from within the single lane section; none resulted from merging congestion. Conditions which were observed to contribute to the occurrence of backups, and which could be controlled, were listed.


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    Evaluation of Automated Work Zone Information Systems

    Tooley, Melissa S. / Gattis, J. L. / Janarthanan, Rajeshkumar et al. | Transportation Research Record | 2004


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    National Research Council (U.S.) | British Library Conference Proceedings | 2005


    Evaluation of Effectiveness of Automated Work Zone Information Systems

    Chu, Lianyu / Kim, Hee-Kyung / Chung, Younshik et al. | Transportation Research Record | 2005