NEC-HFES S tudent Conference11/14/2008
Andrew KunJonathan Oppelaar Zeljko Medenica
Oskar Palinko
University Of New Hampshire
Tim Paek
M icrosoft Research
Introduction
GPS -based personal navigation devices (PND) commonly found in vehicles
M ost PNDs combine audio-visual informationEffect on driving
Addressed Questions S tandard vs. voice-only PNDs:
Difference in driving performance? Difference in time looking at the road?
ExperimentWithin subjects experimentThree navigation aids:
Paper directions, S tandard PND directions, V oice-only directions.
Equipment: high-fidelity driving simulator, eye-tracker, 7” LCD screen
Driving environment: two-lane city road
Check out our simulator video at http://www.tinyurl.com/p54sim
LCD screen: map with route (or odometer)
Eye tracker cameras and IR
illuminator
Rear view “mirror” LCD screen
Camcorder (manual data transcription)
Collected DataDriving performance measures:
Lane position, S teering wheel angle, V elocity.
V ariancesGaze angles - eye-tracker Intersections rejected
Results
ConclusionsDriving performance:
No difference for standard PND vs. voice only Paper directions much worse
Time subjects spent looking at the road: ~94% for voice only ~89% for combined voice and visual
But…M ost participants preferred combined voice
and visual aidHypothesis: subjects need reassurance
Future work: model this behavior and predict when reassurance may be needed
Questions?