Optimization method for signal coordination control of urban road intersections under over-saturation condition

The invention discloses an optimization method for signal coordination control of urban road intersections under an over-saturation condition. Compared with the prior art, based on analysis of upstream and downstream traffic stream states of adjacent intersections, through using the wave theory for reference, and by comparing sizes of stop waves of upstream intersections and start waves of downstream intersections as well as vehicle queue conditions of upstream intersections in an artery direction, status values of signal control intersections are determined, and the signal coordination control reliable interval (phase difference) under different states is obtained, accordingly, queue overflow of over-saturation intersections can be controlled within a certain range, the probability of deadlocks at the over-saturation intersections can be reduced greatly, and the queue overflow becomes beneficial self-adjustment of the road intersections under the over-saturation condition.