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Crash Prevention & Safety > Road Geometry Warning > Curve Speed Warning


Curve speed warning systems use roadside detectors and electronic warning signs to warn drivers, typically those in commercial trucks and other heavy vehicles, of potentially dangerous speeds in approach to curves on highways.


Dynamic Curve Speed Warning Sign (High) - Capital cost/unit - $14000 - Lifetime - 20 years(December 2009)

Dynamic Curve Speed Warning Sign (Low) - Capital cost/unit - $14000 - Lifetime - 20 years(December 2009)

Truck Tip Over Warning System - Capital cost/unit - $278611(31 October 2006)

Blank Out Sign (Fiber Optic) (4 Ea.x 8,788 $/ea.) - Capital cost/unit - $10457.5(31 October 2006)

Steel Sign Post (W 6x12) (39.5 lf x 23 $/lf) - Capital cost/unit - $23(31 October 2006)

Concrete Footing (Type 1) (2 ea x 941 $/ea) - Capital cost/unit - $941(31 October 2006)

Steel Sign Post (W 8x18) (33 lf x 32 $/lf) - Capital cost/unit - $32(31 October 2006)

Concrete Footing (Type 3) (3 ea x 976 $/ea) - Capital cost/unit - $976(31 October 2006)

Truck Curve Warning and High Wind Warning System for Bridge - Capital cost/unit - $572000 - Lifetime - 20 years(3/18/2006)

Truck Speed Warning System - Capital cost/unit - $35000 - O&M cost/unit - $500 - Lifetime - 7 years(8/28/2003)

Passive safety treatments were found to be more reliable and affordable than active safety treatments on two-lane rural roads with dangerous horizontal curves in Virginia.(June 2018)

Sequential Dynamic Curve Warning System reduces the number of vehicles exceeding the speed limit by 10 mph or more by 27.8 percent(January, 2014)

Approximately 75 percent of drivers in a large-scale field operational test felt that curve speed warning systems increased safety.(11/21/2012)

A Benefit Cost analysis shows that dynamic curve speed warning signs have 30 percent effectiveness and an incremental B/C ratio between 2.79 to 5.57 for curves that already have static curve warnings.(December 2009)

Simulated Rural Highway Driver Warning Systems (RHDWS) showed a potential reduction of critical events by 21 percent, a decrease of 71 percent for runoff-road crashes, and contributed to smoother driving on the curvy highway.(May 2009)

In Myrtle Creek, Oregon, an advanced curve speed warning system installed on I-5 reduced the speed of 76 percent of drivers surveyed.(June 2006)

In Colorado, a downhill truck speed warning system installed on a curved section of I-70 reduced 85th percentile truck speeds by 27 percent.(November 2001)

An advanced curve warning system on an interstate route in northern California caused over 68 percent of drivers to reduce their speed. (April 2000)

More than 76 percent of drivers on an interstate route in northern California indicated that messages displayed by an advanced curve warning system were useful.(April 2000)