When parking loads of Division 1.1, 1.2, or 1.3 explosives, you may only leave your vehicle unattended when parked _________.

You may leave your vehicle unattended in a safe haven, an approved place for parking unattended vehicles loaded with explosives. Local authorities usually make the designation of authorized safe havens.
When parking in a safe haven, the driver must make sure the owners of the property are aware where it is parked, what product is in the vehicle, and have a representative watch over the vehicle while the driver is away.