Office of Highway Safety Collision Warning Systems Kristin Poland, Ph.D.

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Presentation transcript:

Office of Highway Safety Collision Warning Systems Kristin Poland, Ph.D.

Collision Warning Systems (CWS) Radar based Track other vehicles and stationary objects Prevent rear-end collisions Provide light and sound warnings Moving versus stationary objects

Stationary Object Detection

Perception/Reaction Times and CWS At 70 mph: – 350 feet warning = 3.4 seconds – 220 feet warning = 2.1 seconds Average driver reaction time is around 1.5 seconds Time for brake pedal application and full brake system pressurization (0.5 seconds) – At 70 mph, 2.0 seconds = 205 feet Ideal brakes, longest warning time – Impact speed = 48.5 mph Existing brakes, 220 feet warning time – Impact speed = 68.8 mph

Active Braking CWS Acura RL Adaptive cruise control (ACC) Active braking collision warning systems controls vehicle automatically Benefits may be huge: – Ideal brakes, longest warning time Impact speed = 0 mph

Vehicle Stability and CWS Collision warning systems – Severe evasive maneuvers Vehicle instability – Hard braking on slippery surface – Rapid steer maneuver Stability control system – Roll and directional control

Summary Collision warning systems – Potential to enhance commercial vehicle safety – Reduced effectiveness at highway speeds with stopped vehicles Active braking collision warning systems Electronic stability control (ESC)