Traffic Incident Clearance Time and Arrival Time Prediction Based on Hazard Models

Table 2

Parameters estimates of clearance time probability density distribution fitness for each incident type.

Incident type	Parameters	Gamma	Log-logistic	Weibull	Lognormal
Clearance time for crash	Log likelihood	−23032.7	−23007.3	−23128.9	−23202.9
	Domain	0 < y < Inf	0 < y < Inf	0 < y < Inf	0 < y < Inf
	Mean	40.3562	45.586	40.5906	42.8821
	Variance	967.94	11380.3	1020.94	2143.83
Clearance time for stationary vehicle	Log likelihood	−71707.57	−70991.8	−71724.7	−71306.9
	Domain	0 < y < Inf	0 < y < Inf	0 < y < Inf	0 < y < Inf
	Mean	33.2276	39.749	33.189	35.3951
	Variance	1032.58	975.23	1142.8	2897.44
Clearance time for hazard	Log likelihood	−20244.6	−20437.6	−20245.9	−20527.5
	Domain	0 < y < Inf	0 < y < Inf	0 < y < Inf	0 < y < Inf
	Mean	68.5289	103.329	68.5441	83.078
	Variance	4382.43	4478.4	4357.8	22634.2