Sustainable Intersection Control Accommodating Urban Freight Mobility

15. Supplementary Notes Supported by a Grant From the U.S. Department of Transportation, University Transportation Centers Program 16. 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.