Exploring the Influence of Truck Proportion on Freeway Traffic Safety Using Adaptive Network-Based Fuzzy Inference System

Table 1

The base information of collected data.

Statistical data		Range		Mean value		Standard deviation
Truck proportion (/h)		17.6–90.5%		36.4%		0.198
The volume of truck (h)		82–515		180.78		61.047
The volume of vehicle (veh/h/ln)		240–816		553.69		145.512
The mean speed (km/h)		47.136–118.722		88.231		12.803
The average speed difference of truck and small car (km/h)		7.21–39.519		23.749		7.664
Speed standard deviation (km/h)		10.129–26.065		18.609		3.534
Coefficient of variation		0.12–0.34		0.215		0.0506