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New law. â¢ allows township supervisors or village managers to request the road commission change those gravel road segments to a posted 45 miles per hour speed limit. â¢ allows communities to request speed limits lower than 45 miles per hour on gravel roads. â¢ this requires that the Michigan State Police conduct speed studies in those cases, and allows lower speeds only when justified by the studies.
A properly set speed limit will be within 3 miles per hour (Â±) of this observed speed. The posted speed limit will then be rounded to the nearest 5 miles per hour. Research has shown that the 85th percentile speed is the speed where accident involvement is the lowest. Reducing the speed limit below what is warranted can actually be detrimental to safety.