"For transportation, make sure:
the propane cylinders are maintained in an upright position so that the gaseous propane remains constantly in contact with the safety valve to minimize the risks in case of a leak.
the cylinder's valve is closed properly. It is mandatory that the outlet of the supply valve from refillable cylinders of 45 lbs. or less be fitted with a weather cap or a dust cap, as applicable. It is also highly recommended to use weather caps on cylinders of greater capacity.
to follow the additional conditions for transporting dangerous materials in Québec, wich are, among others:
It is forbidden for an on-road vehicle carrying more than two (2) propane cylinders to circulate inside any tunnel where a road sign forbids it.
Only cylinders having a water capacity of 46 litres or less (which corresponds to propane cylinders of 40 lbs. and less) may be transported inside such tunnels.
Before a recreational vehicle carrying propane boards a ferryboat, the driver must notify the ship’s captain
or his representative.
It is forbidden to transport or store propane cylinders aboard a private vehicle, unless the space to receive the cylinder is vented to the outside. To this purpose, a window or the trunk, depending on where the cylinder is placed, must be left at least partially opened. Make sure the cylinder does not tip off, either by using a holder or by securing it with a strap. Close the supply valve of the propane cylinder of a recreational vehicle when travelling, even when the cylinder is located on the outside of the vehicle. "