Lesson
Include pedestrian collision warnings on in-vehicle heads-up displays to reduce reaction time, maximum deceleration, and, in some cases, stopping distance and braking time.
Study performed with sixteen drivers with actual pedestrians in a parking lot environment evaluated a display showing the word “BRAKE” and a virtual shadow that changes size as the vehicle gets closers to the pedestrian.
03/07/2016
Nationwide; United States
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Lesson Learned
Include pedestrian collision warnings on in-vehicle heads-up displays to reduce reaction time, maximum deceleration, and, in some cases, stopping distance and braking time.
- Reaction, Braking Time, and Time to Stop: Post-hoc tests found the virtual shadow reduced reaction time while increasing braking time, resulting in the same time to stop as the baseline for near and far targets. The brake sign warning reduced reaction and braking times, resulting in reduced time to stop, target distance did not affect reaction time.
- Maximum Deceleration: For the near targets, both interface designs reduced maximum deceleration. For the far targets, the traditional warning showed even higher maximum deceleration than the baseline.
- Stopping Distance and Gap: For far targets, both HUD interfaces reduced stopping distance, which resulted in larger gaps leading up to the pedestrians. There was no improvement for the near target.
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Lesson ID: 2017-00775
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