Capacity Optimization of an Isolated Intersection under the Phase Swap Sorting Strategy
27 Pages Posted: 14 May 2013 Last revised: 1 Nov 2014
Date Written: May 17, 2013
It is well recognized that the left turn reduces the intersection capacity significantly, because some of the traffic lanes cannot be used to discharge vehicles during its green phases. In this paper, we operationalize the phase swap sorting strategy (Xuan, 2011) to use most, if not all, traffic lanes to discharge vehicles at the intersection cross section to increase its capacity. We explicitly take into consideration all through, left- and right-turning movements on all arms and formulate the capacity maximization problem as a Binary-Mixed-Integer-Linear-Programming (BMILP) model. The model is efficiently solved by standard branch-and-bound algorithms and outputs optimal signal timings, lane allocations, and other decisions. Numerical experiments show that substantially higher reserve capacity can be obtained under our approach.
Keywords: signal control, signal timing, sorting strategy, pre-signal, capacity optimization
JEL Classification: L92, R41
Suggested Citation: Suggested Citation