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Volume 12: A Guide for Reducing Collisions at Signalized Intersections

Making Signalized Intersections Safer

Although intersections are but a small part of the overall highway system, they are the point at which traffic movements most often conflict with one another. As a consequence, nearly 25 percent of all fatal crashes occur at intersections, and about 30 percent of those are at intersections controlled by signals. Fatal crashes at signalized intersections are predominantly multi-vehicle incidents, with 85 percent of them occurring in urban areas.


  • Reduce frequency and severity of intersection conflicts through traffic control and operational improvements.
  • Reduce frequency and severity of intersection conflicts through geometric improvements.
  • Improve sight distance at signalized intersections.
  • Improve driver awareness of intersections and signal control devices.
  • Improve driver compliance with traffic control devices.
  • Improve access management near signalized intersections.
  • Improve safety through other infrastructure Treatments.


Download this guide: http://gulliver.trb.org/publications/nchrp/nchrp_rpt_500v12.pdf

NCHRP 500-12
Signalized Intersections

Good geometric design combined with appropriate traffic controls can result in intersections that operate efficiently and safely. This guide focuses on reducing fatalities at signalized intersections through low-cost, short-term improvements. It provides strategies that include comprehensive design features, as well as traffic operational and enforcement factors, and improved emergency response measures, such as signal preemption.

Download the guide in PDF

View the Guide and Appendices in HTML

Order a printed copy

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