Developing a Travel Time Estimation Method of Freeway Based on Floating Car Using Random Forests

Table 6

Variable importance.

Variable	Variable importance
mean travel time of floating car	58.98
density of vehicle	35.58
traffic state parameter	29.95
median travel time of floating car	15.72
density of floating car	5.39
speed of vehicle	4.74
occupancy of vehicle	2.75
speed of floating car	1.68
traffic flow of vehicle	0.22
number of vehicle	0.22
occupancy of floating car	0.21
traffic flow of floating car	0.15
number of floating car	0.07
ratio of floating car	0.05