The Michigan statute specifies the speed limit for a road is 55 mph (25 mph for subdivision streets) unless otherwise posted.
Fred Keena, traffic engineer for the Ottawa County Road Commission, further explained what you'll see on our local roads:
"When we post a speed zone, such as 45 mph, we have two ways of denoting the end of the zone — post a '45 mph speed limit ends' sign or post a 55 mph sign that gives notice of the statutory statewide speed limit," he said. "Because all motorists should know the speed limit of a road is 55 mph unless otherwise posted, we choose to use the passive (speed zone ends) signing so motorists don’t automatically accelerate at the end of the speed zone."
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