United States Department of Transportation
i
Sustainable intersection control to accommodate urban freight mobility.
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2009-08-01
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[PDF-707.16 KB]
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Edition:Technical report; Sept. 2008-Aug. 2009.
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Abstract:In this research, we studied green extension of a two-phased vehicle−actuated signal at an isolated
intersection between two one-way streets. The green phase is extended by a preset time interval, referred to
as critical gap, from the time of a vehicle arrival. The green phase switches if there is no arrival during the
critical gap. We developed a model following a Poisson process that studied the intersection performance of
traffic. We extended the model to cover the case of general traffic. Additionally, we derived system
performance measures. Our findings show that our model is fairly flexible in accommodating freight traffic,
and our model in the general case is asymptotically accurate under heavy traffic. Numerical tests show that
the presence of critical gaps increases vehicle delay in most cases. This finding is enlightening regarding
current practices.
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