4. A temporary diversion has been constructed on a highway of +3% gradient due to major repairs that are being undertaken on a bridge. The maximum speed allowed on the diversion is 25 mi/h.

A. Determine the minimum distance from the diversion that a road sign should be located informing drivers of the temporary change on the highway. Assume that a driver can read a road sign within their area of vision at a distance of 40 ft for each inch of letter height