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FAQ
  Work Zone Speeds
Why were the guidelines for work zone speed limits changed?
 
Answer:
Since 1988, changes in the Michigan Vehicle Code have affected work zone speed limits in Michigan, resulting in different speed limit criteria being applied statewide. These inconsistencies have made enforcement difficult as motorists may see speed limits reduced 10 mph in one work zone, and then see 25 mph reductions in another work zone.

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