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Alternative Title:Equal Severity Curve update.
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Abstract:Caltrans uses the Equal Severity Curve to determine appropriate locations for the placement of guardrail on
embankments. The ESC assists designers in determining the relative severity of encroachments on embankments
versus impacts with roadside barriers. The line, or curve, shown on the ESC design chart represents combinations of
embankment height and slope that result in a crash’s severity being generally equal to the severity of the average
impact with a roadside barrier. Overall, crash severity will be lessened if guardrail is used on embankments that plot
above the line of the ESC.
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