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U.S.
Department of Transportation
Queue Warning (Q-WARN)
§Queue warning (Q-WARN)
aims to provide drivers timely warnings and alerts of impending
queue backup.
□To reduce shockwaves and prevent collisions and other
secondary crashes
□Predict location, duration and length of queue
propagation
□Utilize V2V and I2V communication for rapid
dissemination and sharing of vehicle information
▪E.g., position, velocity, heading, and
acceleration of vehicles in the vicinity
□Allows drivers to take alternate routes or change
lanes
□Applicable to freeways, arterials, and rural
roads
