The Department of Transportation may, in the manner provided in Section 22404 determine the maximum speed, not less than five miles per hour, which can be maintained with safety to any bridge, elevated structure, tube, or tunnel on a state highway. Said department may also make a determination with reference to any other highway upon receiving a request therefor from the board of supervisors or road commissioner of the county, the governing body of the local authority having jurisdiction over the bridge, elevated structure, tube, or tunnel.