What must be used to secure a vehicle transporting LP Gas when parked?

Using chock blocks to secure a vehicle transporting LP Gas when parked is essential for preventing accidental movement. Chock blocks are wedges made from materials that can withstand the weight of the vehicle and ensure that it remains stationary on sloped or uneven surfaces. This is particularly crucial for vehicles carrying flammable materials like LP Gas, as any unintended movement could lead to dangerous situations, such as spills or accidents.

The design of chock blocks allows them to effectively grip the tires and prevent rolling, thereby enhancing safety during loading and unloading operations or while the vehicle is parked for an extended period.

While other options, such as jack stands and wheel locks, serve purposes in vehicle stability and security, they are not specifically designed for securing vehicles transporting hazardous materials like LP Gas. Traffic cones are primarily used for directing traffic and providing visibility but do not prevent vehicle movement. Therefore, chock blocks are the most effective and appropriate choice for ensuring safety when a vehicle transporting LP Gas is parked.