Number

Variable names

Data source

1

AADT

Control Section Analysis System (CANSYS) database

2

Segment length

3

Lane width

4

Shoulder width

5

Maximum speed limit

6

Number of lanes

7

Shoulder type

8

Surface type

9

Functional classification

10

Rumble strip presence

11

Degree of curve

12

Median type

13

Median width

14

Cross slope

15

Area type(rural/urban)

16

Presence of curve

17

Percentage of heavy vehicle

18

International Roughness Index (IRI)

Pavement Management Information System (PMIS) database

19

Presence of on or off ramps

Google map

20

Side friction coefficient

Kansas Department of Transportation (KDOT)

21

Access density

KDOT video-logs

22

Density of trees

Google map

23

Density of poles/mile

Google map

24

Roadside Hazard Rating (RHR)

KDOT video-logs

25

Number of interchanges on freeway segment

Google map