A photo-radar enforcement van reduced the number of speeding vehicles in a work zone by 24 percent.

Experience with automated enformcent in Oregon.

April 2010
NW Yeon Ave,Portland,Oregon,United States

Summary Information

This project examined the effects of a photo-radar speed enforcement system on average vehicle speeds in a highway work zone on US 30 in northeast Portland, Oregon. The evaluation was conducted to quantify impacts on general safety conditions and assess if benefits persisted once the equipment was removed.

The control area included a two mile work zone subject to heavy traffic and frequented by large trucks. Traffic sensors were inconspicuously mounted on available utility poles in the study area to measure traffic volumes, vehicle speeds, lane occupancy, and vehicle classifications before, during, and after photo-radar speed enforcement vans were deployed and enforcement warning signs posted in the work area

Key data collection periods:
  • Prior to work zone and photo-radar enforcement (November 2008 to March 2009)
  • After the work zone was established, but before photo-radar enforcement was implemented (March 2009 to September 2009)
  • After the work zone was established and during periods with photo-radar enforcement (March 2009 to mid-September 2009)
  • After photo-radar enforcement equipment and signs were removed (late-September 2009).
With a posted speed limit of 40 mi/hr and an average speed of 45 mi/hr measured in the work zone prior to enforcement, the percentage of vehicles traveling faster than 45 mi/hr was used to measure impacts.


During photo-radar speed enforcement speeding was reduced by an average 23.7 percent at the detection site within the work zone. The observed speeding reduction, however, was temporary and did not persist beyond the departure of the photo radar enforcement van.

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Photo Radar Speed Enforcement in a State Highway Work Zone: Demonstration Project Yeon Avenue – Final report

Author: Joerger, Mark

Published By: Oregon DOT

Source Date: April 2010

Other Reference Number: Report No. SR 500-390



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smart work zone systems, automated enforcement, smart work zone, smart work zones, Smart work zone, Smart work zones, workzone, WZ

Benefit ID: 2014-00893