Optimizing the Junction-Tree-Based Reinforcement Learning Algorithm for Network-Wide Signal Coordination

Table 4

Queue length-based improvement analysis of optimization methods.

Congestion level	Test group	Average queue length of the system	Average queue length of the intersection
			Intersection 5	Intersection 8	Intersection 11	Intersection 14
Low	Group 1	0.36	0.35	0.32	0.43	0.37
	Group 2	0.32	0.38	0.30	0.32	0.31
	Group 3	0.33	0.36	0.31	0.35	0.29
Medium	Group 1	0.51	0.50	0.47	0.45	0.53
	Group 2	0.43	0.40	0.42	0.44	0.48
	Group 3	0.44	0.41	0.45	0.42	0.46
High	Group 1	0.83	0.84	0.82	0.76	0.81
	Group 2	0.71	0.73	0.87	0.70	0.69
	Group 3	0.71	0.75	0.81	0.72	0.71