V-1.2, r. 5 - Regulation respecting off-highway vehicles

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19. The sign shapes must be as follows:
(1)  regulatory signs must be rectangular, with the exception of the mandatory stop sign which must be octagonal;
(2)  danger and roadwork signs must be diamond-shaped or square, with the exception of hazard markers which must be rectangular.
O.C. 1222-2004, s. 19.