Signal Control Strategy for Supersaturated Traffic at Urban Road Intersections with a Large Technical Grade Gap

Table 7

Comparison of queue length and delay at the intersection before and after signal timing optimization.

Entrance	Length of road (m)	Average queue length			Average delay per vehicle of the approaches			Average delay per vehicle of the intersection
		Before optimization (m)	After optimization (m)	Variation (%)	Before optimization (s)	After optimization (s)	Variation (%)	Before optimization (s)	After optimization (s)	Variation (%)
West entrance	600	511	350	−31.5%	48.07	39.94	−16.91	38.22	40.68	6.44
East entrance	600	332	166	−50%	45.49	37.78	−16.95
South entrance	1100	191	207	8.4%	35.70	45.49	16.67
North entrance	1200	166	185	11.4%	34.93	40.77	16.72