APPENDIX C: SUBJECTIVE MEASURES, SITUATION AWARENESS
QUESTIONS, AND ATIS MESSAGES

Subjective Measures

TRUST

How well was the ATIS system able to notify you of roadway conditions and hazards?

0___________________________________100

SELF-CONFIDENCE

How well were you able to identify roadway conditions and hazards?

0___________________________________100

MENTAL DEMAND

How much thinking was required to operate this vehicle?

0___________________________________100

PHYSICAL DEMAND

How much physical activity was required to operate this vehicle?

0___________________________________100

DRIVING PERFORMANCE

How safely were you able to drive?

0___________________________________100

CONFIDENCE

How confident are you in your answer to the previous question?

0___________________________________100

Questions for Situation Awareness Queries

Level 1

Perception of relevant information

1. Did you receive a message from ATIS in the last 30 seconds?

a. yes b. no

2. What is your current speed?

a. > 40 mph b. < 40 mph

3. Which lane are you currently in?

a. right b. left

4. What color was the light through which you most recently passed?

a. green b. yellow

5. On what side of the road were the last pedestrians?

a. right b. left

6. At the last intersection, from which side was the cross traffic coming?

a. right b. left

7. How many pedestrians were at the last intersection?

a. one b. two

8. Is there currently a vehicle ahead of you in the right lane?

a. yes b. no

Level 2

Comprehension of the meaning of the information

9. Which action did the most recent ATIS message call for?

a. reduce speed b. change lanes

10. What is the speed of the car ahead relative to your speed?

a. slower b. faster

11. What did your last message from the ATIS warn you about?

a. icy road ahead b. curve in road ahead

12. What was the billboard that you most recently passed advertising?

a. food b. gas

13. What did your last message from the ATIS warn you about?

a. disabled vehicle b. construction

Level 3

Using the information to predict future events

14. Should you be driving less than 35 mph over the next 30 seconds?

a. yes b. no

15. Will you need to be in the left lane in the next 30 seconds?

a. yes b. no

Instance	Message	Appropriate Response
Group 1
1. Icy road	a. Icy road ahead (A) b. Slow down (C)	Slow down
2. Curve in road	a. Curved road ahead (A) b. Slow down (C)	Slow down
3. Speed-limit change	a. 25-mph zone ahead (A) b. Slow down to 25-mph (C)	Slow down
4. Pedestrian crossing	a. Pedestrian crossing ahead (A) b. Slow down (C)	Slow down
Group 2
5. Transit lane	a. Transit-only right lane (A) b. Merge left (C)	Merge left
6. Accident ahead	a. Accident ahead in right lane (A) b. Merge left (C)	Merge left
7. Disabled vehicle	a. Disabled vehicle ahead (A) b. Merge left (C)	Merge left
8. Construction ahead	a. Construction in right lane (A) b. Merge left (C)	Merge left

A=Advisory
C=Command


Group 1. Messages requiring responses involving vehicle speed.
Group 2. Messages requiring responses involving vehicle position

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