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

Traffic Sign Life Expectancy


Principal investigators:

Project status

In progress

Start date: 09/01/16
End date: 02/28/18


Sponsor(s): Iowa Department of Transportation

About the research


At present, there is only a limited understanding of the service life of signage in the field (largely based on manufacturer guidance as opposed to field data and experience). Yet knowing how long a sign will maintain adequate retroreflectivity and remain in acceptable condition is essential in avoiding potentially unnecessary maintenance or replacement costs.

This project will attempt to evaluate the retroreflectivity service life of signage in the field to determine expected sign life values. The information and analysis through this project should be of value to agencies in understanding the service life of signs in the field and more effectively applying their selected management method of sign replacement.