In Minneapolis, implementation of a queue warning system resulted in 54 percent decrease in near-crashes and 22 percent decrease in crashes along segment of interstate.

The queue warning system (QWARN) uses in-pavement loop detectors and Machine Vision Detectors (MVDs) to sense dangerous traffic conditions and delivers warning messages to drivers to increase alertness

Date Posted
12/21/2018
Identifier
2018-B01275
TwitterLinkedInFacebook

RESULTS

  • Prior to installation, based on 2013 data, there were 11.9 crashes per million vehicle miles of travel (MVMT) and 111.8 near-crashes per MVMT.
  • In the three months of deployment, event frequency reduced to 9.34 crashes per MVMT and 51.8 near-crashes per MVMT.

This indicates a 22 percent decrease in crashes and a 54 percent decrease in near-crashes during the pilot period.