Photo courtesy: Marla Woodward

Beginning May 1, posted speed limits on several highways in Michigan will increase from 70 mph to 75 mph, in an effort to match acceptable speeds with the modern design and safety features of those corridors. The increase will roll out slowly across the state this year, and by mid-November, 600 miles of freeway will have the new speed limit.

While the extra speed may alleviate anxious or impatient drivers, how much time will it really save? Below are maps of the routes that will see the increase, the counties it passes through, and the actual minutes drivers could save, if they drove the entire route.

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I-75 (Bay City to Mackinaw City)

Length of highway: 175 miles

Counties it travels through: Bay, Arenac, Ogemaw, Roscommon, Crawford, Otsego, Cheboygan, Emmet

Time new speed limit saves, end to end: 10.1 minutes

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US-127 (Ithaca to I-75)

Length of highway: 98 miles

Counties it travels through: Gratiot, Isabella, Clare, Roscommon, Crawford

Time new speed limit saves, end to end: 5.6 minutes

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US-131 (M-57 to North of Manton)

Length of highway: 95 miles

Counties it travels through: Kent, Montcalm, Mecosta, Osceola, Wexford

Time new speed limit saves, end to end: 5.4 minutes

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US-10 (M-115 to I-75)

Length of highway: 57 miles

Counties it travels through: Clare, Isabella, Midland, Bay

Time new speed limit saves, end to end: 3.3 minutes

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I-69 (Genesee / Lapeer County line to I-94)

Length of highway: 51 miles

Counties it travels through: Genesee, Lapeer, St. Clair

Time new speed limit saves, end to end: 2.9 minutes

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I-75 (St. Ignace to Sault Ste. Marie)

Length of highway: 50 miles

Counties it travels through: Mackinac, Chippewa

Time new speed limit saves, end to end: 2.9 minutes

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US-31 (South Oceana County line to US-10)

Length of highway: 37 miles

Counties it travels through: Oceana, Mason

Time new speed limit saves, end to end: 2.1 minutes

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I-69 (Saginaw Hwy to Swartz Creek)

Length of highway: 33 miles

Counties it travels through: Clinton, Shiawassee, Genesee

Time new speed limit saves, end to end: 1.8 minutes

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US-127 (I-69 to St. Johns)

Length of highway: 18 miles

Counties it travels through: Clinton

Time new speed limit saves, end to end: 1 minute

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