The National Academies Press

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From page 63... ... 63 S E C T I O N 6 Guidelines for reducing median-related crashes can be classified into three general approaches: • Design guidance to reduce consequences of median encroach ments, • Design guidance to reduce likelihood of median encroachments, and • Countermeasures to reduce likelihood of median encroachments. Highway agency efforts to improve median safety on divided highways have focused primarily on the first approach presented above -- designing or retrofitting medians of divided highways to reduce the consequences of median encroachments. Read the entire page →
From page 64... ... 64 Objective Design guidance/countermeasure Design guidance to reduce consequences of median encroachments Minimize potential for collision with fixed objects Relocate or remove fixed objects in median Reduce consequences of collision with fixed objects Provide barrier to shield objects in median Reduce likelihood of cross-median collisions Provide wider medians Provide continuous median barrier Reduce likelihood of vehicle overturning Flatten median slopes Provide U-shaped (rather than V-shaped) median cross section Provide barrier to shield steep slopes Design guidance to reduce likelihood of median encroachments Improve design of geometric elements Provide wider median shoulder Minimize sharp curves with radii less than 3,000 feet Minimize steep grades of 4 percent or more Improve design of mainline ramp terminals Increase separation between on- and off-ramps Minimize left-hand exits Improve design of merge and diverge areas by lengthening speed-change lanes Simplify design of weaving areas Increase decision sight-distance to on-ramps Countermeasures to reduce likelihood of median encroachments Reduce driver inattention Provide edgeline or shoulder rumble strips Decrease side friction demand Improve/restore superelevation at horizontal curves Increase pavement friction Provide high-friction pavement surfaces Improve drainage Improve road surface or cross-slope for better drainage Reduce high driver workload Improve visibility and provide better advance warning for onramps Improve visibility and provide better advance warning for curves and grades Improve delineation Encourage drivers to reduce speeds Provide transverse pavement markings Minimize weather-related crashes Provide weather-activated speed signs Provide static signs warning of weather conditions (e.g., bridge freezes before road surface) Read the entire page →

From page 63...

... 63 S E C T I O N 6 Guidelines for reducing median-related crashes can be classified into three general approaches: • Design guidance to reduce consequences of median encroach ments, • Design guidance to reduce likelihood of median encroachments, and • Countermeasures to reduce likelihood of median encroachments. Highway agency efforts to improve median safety on divided highways have focused primarily on the first approach presented above -- designing or retrofitting medians of divided highways to reduce the consequences of median encroachments.

Read the entire page →

From page 64...

... 64 Objective Design guidance/countermeasure Design guidance to reduce consequences of median encroachments Minimize potential for collision with fixed objects Relocate or remove fixed objects in median Reduce consequences of collision with fixed objects Provide barrier to shield objects in median Reduce likelihood of cross-median collisions Provide wider medians Provide continuous median barrier Reduce likelihood of vehicle overturning Flatten median slopes Provide U-shaped (rather than V-shaped) median cross section Provide barrier to shield steep slopes Design guidance to reduce likelihood of median encroachments Improve design of geometric elements Provide wider median shoulder Minimize sharp curves with radii less than 3,000 feet Minimize steep grades of 4 percent or more Improve design of mainline ramp terminals Increase separation between on- and off-ramps Minimize left-hand exits Improve design of merge and diverge areas by lengthening speed-change lanes Simplify design of weaving areas Increase decision sight-distance to on-ramps Countermeasures to reduce likelihood of median encroachments Reduce driver inattention Provide edgeline or shoulder rumble strips Decrease side friction demand Improve/restore superelevation at horizontal curves Increase pavement friction Provide high-friction pavement surfaces Improve drainage Improve road surface or cross-slope for better drainage Reduce high driver workload Improve visibility and provide better advance warning for onramps Improve visibility and provide better advance warning for curves and grades Improve delineation Encourage drivers to reduce speeds Provide transverse pavement markings Minimize weather-related crashes Provide weather-activated speed signs Provide static signs warning of weather conditions (e.g., bridge freezes before road surface)

Read the entire page →

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