Rural County Sign Installation Project

One way that has been proven to decrease traffic crashes is to post safety signage alerting travelers to changing conditions ahead. The county has received a grant from ODOT to install over 2,500 curve and stop ahead warning signs throughout unincorporated Clackamas County to improve safety on our roads.

Status: In construction

Schedule: Summer 2021 – Summer 2022

Updated: Oct. 5, 2021

The traffic safety team has assessed and determined proper speeds to post at each road segment where curve warning signs will be installed.

Crash reductions associated with addition of curve warning signs (as compared to curves with no curve warning signs), and stop ahead warning signs are as follows: 

  • Curve Warning Signs with Speed: 13% reduction in all fatal and injury causing crashes
  • Chevrons: 20–35% reduction in fatal and injury causing crashes
  • Intersection Warning Signs with Street Name: 22% reduction in overall crashes; 35% reduction in right-angle crashes
  • Stop Ahead Signs: 35% reduction in angle crashes
  • Double Stop Signs: 11% reduction in overall crashes; 55% reduction in angle crashes

For more information, read the ODOT Fact Sheet on Updated Curve Warning Signs.

Things to be aware of:

  • Traffic impacts will be minor and limited duration.


Funding is provided from the ODOT All Roads Transportation Safety (ARTS) Program.

Department Staff
Christian Snuffin
PE, Project Manager