(1) A traffic control device of a kind mentioned in these Rules has effect for the Rules if—
(a) the device is on a road; and
(b) the device complies substantially with the Rules.
1 "Road" includes a road related area—see rule 11(2).
2 Rule 322(1) and (2) explain the meaning of a traffic control device on a road.
(2) A traffic control device is taken to comply substantially with these Rules unless the contrary is proved.