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had recently sent a questionnaire to all DOTs asking if the industry has a large impact on the success or failure of road-
surveyed state installed curb in conjunction with strong-post side safety features.
guiderail. If so, the questionnaire inquired about installation,
milling and overlay procedures, and whether the surveyed
state had experienced any complications with the guiderail SUMMARY
and curb combination while milling, installing, snow plow-
ing, or overlaying. The survey of the states indicated that most states discour-
Regarding curbbarrier combinations, one state recom- aged the use of curbs on roadways with design speeds over
mended placing the face of the barrier at the back edge of the about 70 km/h. The most common type of sloped curb used
curb. They felt this would lessen the number of nuisance hits by the states was the AASHTO Type B curb. Most states
of the guardrail and lower damage to vehicles that may rub located guardrails such that the face of the curb and the face
the curb slightly. of the barrier were flush consistent with current AASHTO
The state that identified bumper height and vehicle center recommendations. There was a perceived need for better
of gravity as needing to be addressed indicated that the auto- guidelines on the use of curbs on higher-speed roadways and
mobile industry should be included in any research since that on the use of curbs in conjunction with roadside barriers.
