Refining Lane-Based Traffic Signal Settings to Satisfy Spatial Lane Length Requirements

Table 2

Differences of green durations between traffic signal settings with spatial queue requirements and those without spatial queue requirements.

			Overflowing legs			Nonoverflowing legs
	Traffic lanes from leg i=		1	3		2	4
Morning peak	Max RC	=	32.5	22.9	=	21.4	23.2
		=	69.0	49.2	=	12.9	13.6
		=	−36.5	−26.3	=	+8.5	+9.6
	Min total; delay	=	20.0	16.7	=	16.7	17.0
		=	39.4	19.6	=	9.6	10.3
		=	−19.4	−2.9	=	+7.1	+6.7
Off peak	Max RC	=	26.4	24.3	=	23.8	25.4
		=	61.8	58.2	=	15.9	16.8
		=	−35.4	−33.9	=	+7.9	+8.6
	Min total; delay	=	17.0	17.0	=	17.0	17.0
		=	29.8	26.2	=	11.7	12.6
		=	−12.8	−9.2	=	+5.3	+4.4
Evening peak	Max RC	=	27.1	28.4	=	20.2	24.3
		=	56.2	61.1	=	11.9	13.8
		=	−29.1	−32.7	=	+8.3	+10.5
	Min total; delay	=	17.0	17.0	=	17.0	17.0
		=	24.2	29.1	=	8.5	10.2
		=	−7.2	−12.1	=	+8.5	+6.8

Note. is the green durations (in seconds) optimized by the lane-based optimization model; and are the minimum required green durations (in seconds) evaluated by the proposed traffic signal refinement method for not inducing overflowing and reaching ideal traffic state along approach traffic lanes.