Recommended Guidelines for Curb and Curb-Barrier Installations (2005) / Chapter Skim
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Pages 92-94
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From page 92... ...
The study involved the analysis of vehicles traversing several commonly used curb types under a variety of impact conditions, as well as the analysis of vehicle impact into various curb–guardrail combinations. The research presented herein identified common types of curbs that could be used safely and effectively on high-speed roadways and also identified the proper combination and placement of curbs and barriers that would allow the traffic barriers to be effective, i.e., safely contain and redirect an impacting vehicle.
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From page 93... ...
and at offset distances from curb to barrier of 0, 2.5, and 4 m. The results of the curb traversal study indicated that the stability of the pickup truck was not compromised in tracking impacts, but the trajectory of the front bumper was sufficient to imply a risk of barrier override when a standard strong-post guardrail is placed anywhere from 0.5 m to 7.0 m behind 150-mm high curbs or 0.6 m to 7.0 m behind 100-mm high curbs.
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From page 94... ...
Above operating speeds of 85 km/h, guardrails should only be used with 100-mm high or shorter sloping-faced curbs, and they should be placed with the curb flush with the face of the guardrail. Above operating speeds of 90 km/h, the sloping face of the curb must be 13 or flatter and must be 100-mm high or shorter.
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