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Planning Guidance for the Installation and Use of Technology Devices for Transportation Operations and Maintenance

ENTERPRISE Transportation Pooled Fund Study


Curve Warning System

For purposes of the ITS device guidance process, Curve Warning Systems are defined as a collection of devices deployed with the goal of reducing vehicle crashes and roadway departures within horizontal curves. Technology devices may include real-time warning signs triggered by vehicle factors (e.g. speed, height, weather) and/or roadway conditions (snow, ice, and rain) at approaches to sharp curves.

The planning guidelines for curve warning systems are presented as one tool to assist agencies in selecting deployment locations, and are not a replacement for the planning or design process. Also, prior to deploying a Curve Warning System, ensure the basic requirements of the MUTCD (2009 Edition Chapter 2C. Warning Signs and Object Markers) have been met at the location of concern.

Engineering judgment should be used to assess potential implications that may result from installation of Curve Warning Systems. This planning guidance does not mandate the use of Curve Warning Systems.

Three (3) guidelines have been identified to capture the most common uses of Curve Warning Systems. While there are other purposes and uses for Curve Warning Systems, the guidelines developed to date have focused on the following three. If you have suggestion of additional Curve Warning Systems guidelines please contact us.


Curve Warning System Guideline - 1:

Rural Two-Lane Highway Curves


Curve Warning System Guideline - 2:

High Risk Locations


Curve Warning System Guideline - 3:

Truck Rollovers on Ramps/ Curves

  Purpose: To provide additional warnings beyond static advisory curve warning signs to warn drivers of actions required to reduce risks associated with rural two lane curves.   Purpose: To influence driver behavior in horizontal curves where an excessive level of crashes are occurring.   Purpose: To influence the behavior of commercial vehicle operators driving on ramps/curves.  
CCTV | DMS | HAR | RWIS | VSL | Dynamic Speed Displays | Ramp Meters| Curve Warning Systems| Intelligent Work Zones | ICWS
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