Variable name

Variable subgroup

% Marginal effect

I-70 training

I-70 testing

GRADE_LEVEL

Grade

Level

3.22

−1.58

3.62

−1.74

NUMBER_LANES

One lane

Two lanes

Three lanes

Four lanes

Five lanes

Six lanes or more

1.06

2.05

−2.28

−2.94

1.31

0.42

1.23

2.16

−2.77

−2.49

1.53

0.22

RURAL_URBAN

Rural

Urban

1.97

−1.56

2.31

−1.81

CZONE

n/a

1.71

2.33

AADT

n/a

1.92

1.72

HOUR

n/a

1.74

2.09

DAY_WEEK

Sun.

Mon.

Tues.

Wed.

Thurs.

Fri.

Sat.

−2.02

2.31

−2.09

−1.65

−1.38

3.15

2.88

−1.79

1.84

−1.98

−1.43

−1.17

3.37

2.49

MONTH

n/a

1.67

1.89

DIRECTION

East

West

1.47

1.31

1.52

1.36

LIGHT_COND

Daylight

Dark, lighted

Dark, unlighted

−0.43

−0.79

0.59

−0.23

−0.62

0.44

DR_AGE

Less than 21 years

From (21 - 64) years

More than 64 years

2.58

−1.87

2.49

2.87

−1.63

2.61

VEH_TYPE

Passenger car

Motorcycle

Truck

−1.62

2.16

−1.79

−1.44

2.06

−1.48

NO_VEHICLE

One vehicle

Two vehicles

Three vehicles

Four vehicles

Five vehicles

Six or more vehicles

9.58

14.54

13.17

14.39

13.33

15.17

10.62

15.87

13.16

15.04

13.94

14.81

ACC_TYPE

Animal

Fixed object

Overturn

Pedestrian

Vehicle in transport

1.78

7.06

8.39

7.17

7.38

2.19

6.48

7.79

7.36

7.27

DR_DRINK

n/a

−15.56

−16.07

SPEED

n/a

−8.04

−10.12

DR_AGGRESSIVE

n/a

−8.84

−8.41

CELL_TEXT

n/a

−12.54

−14.17