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FHWA Home / Safety / The Systemic Approach to Safety

New York State Department of Transportation Applies Systemic Planning Process to Lane Departure Crashes on State Highway System

Figure 1. NYSDOT Severe Lane Departure Crashes by Curve Radius Comparison for Risk Factor Selection – Long Description

Chart showing percent of crashes and segments by Curve Radii.

Note: Twelve percent of severe crashes occurred in curves with radii less than 300 feet, while only seven percent of all reviewed curves have radii less than 300 feet. Since the proportion of crashes was greater than the proportion of all locations with these radii, a curve radius less than 300 feet was selected as a risk factor.

Figure 1 shows the results of analyzing curve radius as a risk factor. The horizontal axis represents the lengths of curve radii on undivided, rural, two-lane state highways with a posted speed limit of 55 miles per hour in four categories. The four categories are: 100 to 300 feet, 301 to 500 feet, 501 to 700 feet, and 701 to 959 feet. The vertical axis represents percentages ranging from zero to fourteen percent. Two bars representing percentage are shown for each category of curve radius length. One of the bars represents the percent of lane departure crashes that occurred on a curve within the radius range, and the other represents the percent of curves on the state highway system that are within the radius range.

  • Twelve percent of the lane departure crashes occurred on a curve within the 100 to 300 foot radius range. Seven percent of the curves on the state highway system are within the 100 to 300 foot radius range.
  • Twelve percent of the lane departure crashes occurred on a curve within the 301 to 500 foot radius range. Ten percent of the curves on the state highway system are within the 301 to 500 foot radius range.
  • Seven percent of the lane departure crashes occurred on a curve within the 501 to 700 foot radius range. Six percent of the curves on the state highway system are within the 501 to 700 foot radius range.
  • Four percent of the lane departure crashes occurred on a curve within the 701 to 959 foot radius range. Five percent of the curves on the state highway system are within the 701 to 959 foot radius range.

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Page last modified on July 27, 2016
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