CTRE is an Iowa State University center, administered by the Institute for Transportation.

Address: 2711 S. Loop Drive, Suite 4700, Ames, IA 50010-8664

Phone: 515-294-8103
FAX: 515-294-0467

Website: www.ctre.iastate.edu/

Iowa State University--Becoming the Best

Developing a Rural and Urban Roadway Lighting Practical Design Guide for Iowa

Overhead flashing light next to stop sign

Use of overhead flashing beacons at all-way stop intersections


Principal investigators:

Co-principal investigators:

Student researchers:

Project status


Start date: 08/01/05
End date: 03/31/08


Report: Strategies to Address Nighttime Crashes at Rural, Unsignalized Intersections (2.71 mb pdf) February 2008

Tech transfer summary: Strategies to Address Nighttime Crashes at Rural, Unsignalized Intersections (168 kb pdf) Feb 2008


Sponsor(s): Iowa Department of Transportation

About the research


Citizens request the installation of roadway lighting in their communities based on several motivations, including the experience or perception that lighting improves traffic safety and reduces crime, while also providing a tangible benefit of taxpayer dollars at work. Roadway authority staff fully appreciate these citizen concerns; however, roadway lighting is expensive to install, supply energy to, and maintain in perpetuity. The installation of roadway lighting is only one of a number of strategies agencies have to address nighttime crash concerns. This research assists local agencies in deciding when, where, and how much rural intersection lighting to provide.