An operator is securing a 20,000 kg wheel loader onto a low-bed trailer for transport. The loader has designated tie-down points. According to CSA Standard B621, 'Safety Standard for Road Vehicles – Vehicle Tie-Down Devices for Motor Vehicles and Trailers', what is the minimum aggregate working load limit (WLL) of all tie-downs combined for this load?

Question: An operator is securing a 20,000 kg wheel loader onto a low-bed trailer for transport. The loader has designated tie-down points. According to CSA Standard B621, 'Safety Standard for Road Vehicles – Vehicle Tie-Down Devices for Motor Vehicles and Trailers', what is the minimum aggregate working load limit (WLL) of all tie-downs combined for this load?

Answer options: ✅ At least 10,000 kg (half the load's weight).

• At least 16,000 kg (equivalent to 80% of the load's weight).
• At least 20,000 kg (equal to the load's weight).
• At least 40,000 kg (twice the load's weight).

Correct answer: At least 10,000 kg (half the load's weight).

Explanation: According to CSA B621 and generally accepted practices, the aggregate working load limit (WLL) of all tie-downs used to secure a piece of equipment must be at least half the weight of the article being secured. For a 20,000 kg loader, this means a total WLL of at least 10,000 kg.