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

Sequential Dynamic Curve Warning System (Traffic and Parking Control Company (TAPCO))

Image: System installed throughout a curve with chevron LEDs lit up

System installed throughout a curve

Image: System installed throughout a curve day chevrons

System installed on Iowa Hwy 144

Image: System installed throughout a curve day chevrons with motorcyclist on curve

System installed on Wisconsin Hwy 20

Researcher(s)

Principal investigators:

Co-principal investigators:

Project status

Completed

Start date: 12/01/11
End date: 12/31/13

Publications

Reports:

Related publications:

Sponsor(s)/partner(s)

Sponsor(s): FHWA Highways for LIFE (HfL)

About the research

Abstract:

Horizontal curves make up a small percentage of total road miles, yet account for one-quarter of all highway fatalities. The majority of crashes on curves involve lane departures. The Sequential Dynamic Curve Warning System consists of a series of solar-powered, LED-enhanced BlinkerSigns (a Curve Warning BlinkerSign and an array of Chevron BlinkerSigns) that are installed throughout a curve. Approaching vehicles, sensed by radar or other ITS device, trigger the controller that wirelessly activates the LED signs to flash sequentially through the curve to warn speeding drivers to slow down. The field study will evaluate the effectiveness of the technology in reducing vehicle speeds and in reducing the frequency and/or the severity of curve-related crashes. Participating State DOTs include Iowa, Missouri, Texas, Washington, and Wisconsin.