Rural highways

Urban Highways

All Highways

High

Med.

Low

High

Med

Low

High

Med

Low

Automobile

3.76

1.28

0.34

18.27

6.21

1.64

13.17

4.48

1.19

Pickup & Van

3.8

1.29

0.34

17.78

6.04

1.6

11.75

4

1.06

Buses

6.96

2.37

0.63

37.59

12.78

3.38

24.79

8.43

2.23

Single Unit Trucks

7.43

2.53

0.67

42.65

14.5

3.84

26.81

9.11

2.41

Combination Trucks

10.87

3.7

0.98

49.34

16.78

4.44

25.81

8.87

2.32

All vehicles

4.4

1.5

0.4

19.72

6.71

1.78

13.81

4.7

1.24