Optimization model for layout and signal design of full continuous flow intersections

Abstract

Continuous flow intersection (CFI) is a potential treatment to relieve traffic congestion at intersections. Conventional geometric design and signal timing of CFI are usually performed in a trial-and-error way, which may not always yield the truly optimal design. In this paper, an integrated optimization model for design of lane markings, the distances between the crossovers and the main intersection, and signal timings are proposed for the full CFI. The optimization problem is formulated as a mixed-integer non-linear programming problem, which is further transformed into a series of mixed-integer linear programming models and solved by the standard branch-and-bound technique. Numerical analysis results further validate the effectiveness and applicability of the proposed model.