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

Full text
26. The defrosting system of a school bus shall make it possible to keep the part of the windshield wiped by the wipers completely free of condensation, frost and ice.
A hot air vent or any other device making it possible to speed up the melting of snow and ice on the boarding step shall also be installed near the service door of a bus of more than 4,536 kg.
O.C. 285-97, s. 26.