Before-and-After Field Investigation of the Effects on Pollutant Emissions of Replacing a Signal-Controlled Road Intersection with a Roundabout

Table 2

Signalized intersection characteristics [4].

Signal timing (North-South)					Approach characteristics
						Approach
	Green	Amber	Red	Cycle		North	East	South	West
Minimum	49.0	3.0	31.8	85.8	Entering lanes	2	1	2	1
Median	50.1	4.0	46.1	100.1	Exiting lanes	2	1	2	1
Maximum	54.9	4.9	62.1	116.2