Since speed zones are legally described to the nearest thousandth of a mile (5 feet), regulatory speed limit signs should be located within approximately 5 feet of the actual reference marker or milepoint defined in the minute order or city ordinance. Therefore the locations of regulatory speed zones tied to speed changes should be examined carefully to ensure that signs can be erected within the 5 feet variation. If adherence to the 5-feet variation is not possible, the SPEED ZONE sign should be placed as close to the actual location defined in the minute order or city ordinance as practical. For example, if the reference marker or mile point is located at an intersection, the regulatory speed limit signs should be located in accordance with standard procedures for placement of departure signing.