The Minnesota Department of Transportation is raising the posted speed limit from 55 to 60 miles-per-hour on 730 miles along three highways in greater Minnesota. New signs reflecting the higher limits began going up on Monday. This comes after traffic engineers determined that higher limits don’t pose safety risks on the affected routes. The higher limits include the entire length of Highway 75 from the state’s southern corner to the Canadian border. The new speed limit also affects the majority of Highway 59, which also spans the state from south to north. Fourteen miles of Highway 7 will also see a change. It was eight years ago that the state raised the limit on 930 highway miles.