Intent 1:
To supersede the time limitation of Sentence 4.11.2.4.(1) in order to permit a tank vehicle to be left unattended
for more than 1 hour if certain conditions are met.
This is to limit the probability that:
- the tank vehicle will become involved in a vehicular
accident or other impacts, which could lead to damage to the tank
vehicle, which could lead to the escape of liquid, which could lead
to the ignition of vapour from a nearby ignition source, which could
lead to harm to persons nearby, and
- a fire or explosion involving the tank vehicle will
spread to a nearby building, which could lead to harm to persons in
the adjacent building.