Well, the vast majority of "posted" speed limits in Michigan are illegally low.
If you are driving 55 on the Lodge for instance, you really should be cited for obstructing traffic.
The state constitution states that the speed limits are to be based on the 85th percentile, based on the speed-study portion of a traffic engineering study, done during free-flowing traffic, and rounded to the nearest 5 mph. ALSO, they are to measure the speed st the FASTEST portion of that segment, and the posted speed MAY NOT be more than 2mph below that number.
In short, you measure the speed of all cars when traffic is light [Sun morning for example), then discard the fastest 7% and the slowest 7%, and the average of the rest. That's to be the speed limit. On the Lodge for instance, that might be 75 mph, on I-94 70? On 696 West of I-96 it might be 80 or 85 mph.
So if you are driving slower than those speeds, the problem is you, not other drivers. You should probably stay off the freeways, or be given tickets for obstructing traffic. And the guy from the police and the guy from the county that together decide the posted speeds should both be sent to jail for fraud.
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