Wheel anti-slip device
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Question: Wheel chocks are also known as tire positioners, tire stoppers, or vehicle chocks. It is generally made of high-strength rubber or polymer plastics, and its main function is to be placed between the wheels and the ground when the car is parked, thereby effectively preventing the car from sliding backward. In Module 1 of Unit 3, Part IV of the “Training Manual for Qualification of Personnel Engaged in the Transport of Dangerous Goods by Road”, under the section on safety during loading and unloading of various types of dangerous goods and emergency response to accidents, it is stated that the following safety operating procedures must be observed during loading and unloading operations involving tank trucks: (4) Park the truck at a designated location, turn off the engine, and engage the parking brake. Connect the static electricity wires properly; the connections between pipes and pipe fittings must be secure to prevent leaks, and shims should be placed in place effectively. Is there any relevant standard that requires the use of wheel chocks before loading and unloading tank trucks?
That spacer has the effect of preventing slipping
The person on the second floor is right; it’s that spacer block, also known as a triangular block. In the past, most anti-slip materials were made of wood; later on, rubber became more common as it was easier to manufacture, so it was used more frequently. Therefore, the textbook also uses a term “generally adopted””
It can provide anti-slip functionality; the appropriate specifications should be chosen. Nowadays, most of these are rubber pads, but they have one drawback: they break easily if crushed by a vehicle.