Get our free mobile app Rochester, MN (KROC-AM News) - It’s time to slow down. The new 25 mile-per-hour speed limit is taking effect in Rochester. The Rochester Public Works Department issued a news release Wednesday announcing the change from 30 miles per hour on unposted streets. On city streets with speed limits other than 25 miles per hour, changes will take effect when new signs are installed. City officials say that process is expected to begin in the coming weeks and take about six months to complete. The Public Works Department notes the 25 mile-per-hour speed limit will not apply to all city streets. Elton Hills Drive, 37th Street Northwest, and sections of Broadway outside of the downtown business district are among those that will continue to have the current posted speed limit. The speed limits on state and county roads in the city are also not changing.