TABLE 3.

Composite Driving Assessment Scale (CDAS) Used to Evaluate Naturalistic Driving

Discrete Events
1. Follows directions from other occupant	0	1	2
2. Responds appropriately to traffic signs, lights, and road markings	0	1	2
3. Demonstrates appropriate response during emergency situations	0	1	2
4. Starting	0	1	2
5. Backing	0	1	2
6. Parking (horizontal)	0	1	2
7. Uses turn signal	0	1	2
8. Left turn	0	1	2
9. Right turn	0	1	2
10. Proceeds without hesitation	0	1	2
11. Accelerates smoothly, accurately, and timely	0	1	2
12. Stops completely at sign	0	1	2
13. Checks blind spots	0	1	2
14. Centers vehicle in travel lane	0	1	2
15. Brakes smoothly with adequate time and space	0	1	2
16. Demonstrates appropriate steering recovery	0	1	2
17. Speed control	0	1	2
18. Lane keeping	0	1	2
19. Awareness of pedestrians		0	1
Global Assessments
20. Scans timely and comprehensively	0	1	2
21. Uses mirrors properly	0	1	2
22. Maintains safe distance from other vehicles while in motion	0	1	2
23. Able to judge spatial positioning for turns and parking	0	1	2
24. Demonstrates proper use of vehicle equipment	0	1	2
25. Attention	0	1	2
26. Attitude	0	1	2
27. Awareness of how driving affects others	0	1	2
28. Anticipation of traffic situations	0	1	2
29. Reaction time	0	1	2
30. Response to other vehicle’s brake lights, signals, etc.	0	1	2
Total		_________	(/60)

Note. Key: 0 = unimpaired, 1 = mildly impaired, 2 = moderately to severely impaired.