Evaluation of Roundabout Safety Performance through Surrogate Safety Measures from Microsimulation

Table 2

The main statistics of the roundabout data sample.

Statistics	8-year total crashes	AADT [veh/d]	Outer Diameter [m]	Ring Width [m]	Entry Width [m]	Exit Width [m]
min	0	7,000.00	30.00	4.50	3.90	3.75
mean	6	26,022.02	46.85	7.78	5.10	5.21
median	2	21,980.33	50.00	7.50	4.83	5.12
max	34	63,400.00	89.60	11.00	8.15	7.10