United States Department of Transportation
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TRIS Online Accession Number:00962811
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Edition:Final Report February 8 to November 30, 2002
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Abstract:The objective of this multi-phase project was to develop a set of guidelines for the use and design of rumble strips in Missouri which addresses the needs of both motorists and bicyclists and to specifically answer the two design questions posed. With regard to these questions, it was found that shoulder rumble strips (SRS) narrower than the current width and that would fit within the construction joint area could indeed be designed and used safely. Key recommendations pertaining to SRS use are as follows: (1) Install on all rural freeways and expressways; (2) Do not install in urban areas unless an engineering study has been conducted and has found that run-off-road crash history exceeds acceptable values and it is determined that SRS would be effective in reducing those numbers; (3) Speed limit must exceed 45 mph; (4) On non-freeway/expressway sections, free shoulder width must exceed 4 ft (5 ft in guard rail sections). Shoulders not meeting these criteria are not wide enough to accommodate both SRS and cyclists. In this latter event, decision must be made whether, for shoulders wider than 2 ft, crash history or cyclist usage should be given priority on the facility. When SRS are installed in this case, cyclists must be denied access to the facility. For shoulders less than 2 ft wide, SRS should not be installed; and (5) The uninterrupted length of highway must exceed 1/30 of the design speed. The following SRS design recommendations are proposed: (1) Milled-in SRS with 5-in. grooves, 7/16 in. deep, on 12-in. spacing; (2) For all freeways use continuous strips that are 16 in. wide and 6 in. offset from the shy line; (3) For non-freeways with shoulder widths exceeding 6 ft, use intermittent strips (12-ft gaps with 60-ft cycles) that are 16 in. wide and 6 in. offset from the shy line; (4) For non-freeways with shoulder widths from 5 ft to 6 ft, use intermittent strips (same pattern as above) that are 12 in. wide, on the shy line; (5) For non-freeways with shoulder widths from 2 ft to 5 ft, conduct needs studies based upon crash histories and bicycle use; and (6) For non-freeways with shoulder widths less than 2 ft, do not install SRS. A process for evaluating the on-site performance of rumble strips to be used to refine the guidelines to best suit Missouri's conditions is also provided.
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