If a qualifying municipality decides to set a speed limits limit in accordance with this paragraph, the municipality shall provide written notice of that determination to the Commissioner of Transportation and shall set speed limits for all qualifying roads in that municipality.

Unless otherwise approved as provided in paragraph D, a speed limits limit set by a municipality must be in 5-mile-per-hour increments within the following ranges:

Prior to establishing a speed limit, the municipality must perform a traffic investigation that reviews the factors identified in the applicable sections of the Manual on Uniform Traffic Control Devices. The municipal officers shall validate that speed limit in accordance with the procedure for establishing municipal traffic ordinances set forth in Title 30-A, section 3009, post standard speed limit signs in accordance with the Manual on Uniform Traffic Control Devices and provide written notice of that speed limit zone to the Commissioner of Transportation on forms approved by the Department of Transportation.

The Department of Transportation may require a municipality with a population of 5,000 or more as measured by the latest decennial United States census that has not provided written notice to the department that the municipality will set a speed limits limit on a qualifying road in accordance with this paragraph to provide the department with all data necessary to set such a speed limits limit. The nature, extent and form of that data must be acceptable to the department and may include, without limitation, the reason for the request, length and location of the proposed speed zone, road width, number of driveways in that zone, traffic volume, posted speed, prevailing speed as measured by radar, accident history and speed enforcement efforts; and