The Impact of Truck Proportion on Traffic Safety Using Surrogate Safety Measures in China

Table 6

Traffic status level of the classification of indicators and truck proportion.

Indicators of evaluation	Period of time	Threshold of the classification	Truck proportion	Traffic flow status
85%V–15%V	5 minutes	≥41.503 km/h	0.2–0.6	Dangerous
		<41.503 km/h	0−0.4, 0.5-1.0	Safe
	10 minutes	≥42.127 km/h	0.2–0.6	Dangerous
		<42.127 km/h	0.1−0.3, 0.6−0.9	Safe
	15 minutes	≥42.672 km/h	0.2–0.6	Dangerous
		<42.672 km/h	0.1−0.3, 0.6−0.9	Safe
Speed variation coefficient	5 minutes	≥0.224	0.2−0.6, 0.8−1.0	Dangerous
		<0.224	0.1−0.4, 0.7−1.0	Safe
	10 minutes	≥0.224	0.2−0.6, 0.8−1.0	Dangerous
		<0.224	0.1−0.4, 0.7-0.9	Safe
	15 minutes	≥0.223	0.4–0.6	Dangerous
		<0.223	0.1−0.4, 0.7−0.9	Safe