Quantification of Rear-End Crash Risk and Analysis of Its Influencing Factors Based on a New Surrogate Safety Measure

Table 5

Significant main effects for rear-end crash risk.

Variables	Statistical results	Dummy variables	Rear-end crash risk
			Mean	Std. Dev.
Day-of-week	F = 58.1,	Holiday	0.0028	0.0031
		Workday	0.0032	0.0033
Time-of-day	F = 18.5,	Off peak	0.0030	0.0033
		Morning peak	0.0034	0.0033
		Evening peak	0.0032	0.0032
Light condition	F = 8.8,	Daytime	0.0032	0.0032
		Nighttime	0.0030	0.0034
Weather condition	F = 0.7,	—	—	—
Traffic density	F = 1655.0,	High	0.0049	0.0027
		Median	0.0049	0.0033
		Low	0.0021	0.0029