T-12, r. 17 - Regulation respecting road vehicles used for the transportation of school children

Full text
14. The bumpers of a school bus, except for the bumper guards, shall be capable of withstanding pushing by another bus of the same mass on level ground without suffering permanent distortion and shall be capable, in those same conditions, of preventing permanent distortion to the chassis or body. The rear bumper shall be attached directly to the chassis frame in such a manner as to make it impossible to ride on it or cling to it.
O.C. 285-97, s. 14.