is deemed safe to do so. MDOT and the MSP announced on April 26, 2017, that the speed limit was increased to 75 mph on several Michigan freeways, including I-75 from Bay City to Sault Ste. Marie (excluding the Mackinac Bridge), I-69 from Business Loop 69 in Clinton County to I-94 in St. Clair County (excluding the section in and around Flint, which remains at ), US 127 from I-69 in Clinton County to I-75 in Crawford County (excluding the 15-mile stretch between St. Johns and Ithaca, which is not freeway standard), and US 131 from M-57 in Kent County to the end of the freeway north of Manton. These increases commenced on May 1, 2017, and were completed by May 15, 2017. Speed limits in freeway work zones are statutorily limited to 24 hours per day. If workers are present (and not behind a barrier wall), drivers must slow to for the workers' safety. For many years, trucks generally had a speed limit of , but this was increased to in 2017. Michigan's speed limits on urban Interstates are typically higher than its adjacent states. For example, in the Detroit metro area, I-75 southbound enters Detroit at M-102 (8 Mile Road, exit 59) and maintains a limit all the way until the interchange with I-94 (exit 53), where the speed limit drops to . Other freeways in Detroit such as I-94 and I-96 also have speed limits in and around the city's downtown area, but rise to relatively soon after leaving the downtown area. In Downtown Grand Rapids, I-196 has a speed limit of , the only other urban Interstate Highway to have a reduced speed limit. US 131 in Grand Rapids is one of the only non-Interstate urban freeways in Michigan with a speed limit, which was raised from in 2013. Furthermore, speed limits in smaller cities, including Ann Arbor, Battle Creek, Flint, Kalamazoo, Lansing (the state capital), and Saginaw remain at . The default speed on all other highways, whether two or four lanes, is . However, Michigan permits speed limits of up to after a safety study concludes the higher limit is safe to implement. Until 2016, this provision only applied to four-lane divided non-limited access highways. A stretch of US 127 between St. Johns and Ithaca was posted at , as a compromise to allow a freer flow of traffic due to insufficient funds to