United States Department of Transportation
i
Use Case: Curve Speed Warning Benefit-Cost Analysis
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2022-07-11
[PDF-927.18 KB]
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Abstract:This document serves as a use case for conducting Benefit-Cost Analysis (BCA) for a hypothetical curve speed warning project. Crashes occurring at locations with curves are common with passenger vehicles as well as with heavy vehicles or trucks. When crashes occur, they often result in property damage, injury or a higher-than-average percent of fatalities. Curve speed warning systems provide warnings to drivers helping them select a safe and appropriate speed when approaching a horizontal curve. These systems consist of a speed detection device that activates a dynamic sign (DMS) advising motorists to slow down when vehicles are traveling above a certain speed threshold. Sequential dynamic chevrons may also be deployed throughout the curve. Horizontal curves can create safety concerns that result in vehicles and trucks running off the road, turning over or hitting the guardrail. Horizontal curves make up a small percentage of total road miles, yet account for one-quarter of all highway fatalities. Most curve-related crashes are attributed to speeding and driver error and involve lane departures. (Source: FHWA LowCost Treatments for Horizontal Curve Safety 2016). This use case assumes a system deployment at 10 high crash curve locations on rural two-lane roadways.
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