“…Among them, 56% of the accidents occurred in the grade and highway, resulting in 40,676 people were killed and 120,556 injured (Weng et al 2015).With the rapid economic development, China's highway in the past decade has developed very fast, and the total mileage of the highway has reached 125,000 km.Therefore, this led to highway traffic accidents have soared (Wang et al, 2016;Wang et al, 2013).Research shows that China 's highway rear-end accidents accounted for about 40% of all traffic accidents, casualties is accounted for 60% (Wu and Thor, 2015;Xiao, 2016).Rear-end accident is very serious in China's highway. Figure 1 is a highway accident statistics, it can be seen that the proportion of rear-end accidents accounted for the largest, which reaching 34.3% (Wang et al, 2016).Therefore, it is necessary to carry out analysis and research on the rear-end accident, and to grasp its characteristics, especially the analysis of vehicle speed. Highway traffic accident is characterized by rapid speed, vehicle damage and serious casualties, especially the car rear-end collision truck(Abdel-Aty and Abdelwahab, 2003;Alpar and Stojic,2016).There are many research on early warning of the rear-end accident onhighway.…”