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Rumble Strips

MDOT is attempting to be bicycle friendly with their new rumble strip safety initiative.

In Michigan there are approximately 1,299 miles (2,598 if you count both sides of the road) of road that are candidates for rumble strips. Of this number there are about 50 miles of divided "M" routes (200 miles if you count both shoulders of the road in each direction). MDOT projects annual crash reduction of: 105 crashes, 9 A-injuries (serious/near fatal) and 1 fatality.

MDOT's general guidelines for installing rumble strips:

A road must have a shoulders 6' or greater with posted speeds over 55 mph.  The rumble strips on "M" roads are not like those on the highways which are continuous and usually ½" to 5/8" deep. The rumbles on the shoulders of the "M" routes are not deeper than 3/8"inch and will have 12' breaks every 48'.  There are additional requirements to provide longer gaps at commercial driveways, intersections and bridges. When a shoulder approaches an intersection, the rumbles are to end 50' before the intersection or 50' before the beginning of a right turn lane to allow the cyclists on the shoulder enough time to move into the thru lane if they are going straight.

MDOT's Non-motorized Program and the Traffic and Safety division collaboated in devloping the rumble strip guidelines to improve safety of both cyclists and motorists MDOT plans to reevaluate the rumble strip program to see what sort of safety benefits resulted after three years.

MDOT Rumble Strip Guidelines

MDOT Guidelines for the use of rural, non-freeway rumble strips.

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Date 2010-04-07
Filesize 315.09 KB
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