Developing a Travel Time Estimation Method of Freeway Based on Floating Car Using Random Forests
Table 2
The standard of traffic state classification of a freeway [32].
Traffic state
Density Range
Design speed (mi/h)
75
65
(pc/mi/ln)
Speed (mi/h)
Traffic flow (pc/h/ln)
Speed (mi/h)
traffic flow (pc/h/ln)
A
11
75
820
65
710
B
18
74.8
1350
65
1170
C
26
70.6
1830
64.6
1680
D
35
62.2
2170
59.7
2090
E
45
53.3
2400
52.2
2350
F
>45
<53.3
>2400
<52.2
>2350
Note: in order to keep the data neat, the unit used pc/mi/ln and mi/h in Table 2. Table 2 can change into pc/km/ln and km/h by 1mi = 1.609km. The number in Table 2 is the maximum value of each level.
