Correct answer
One suitably sized chock per vehicle.
One chock per vehicle, suitable for its maximum permitted gross mass and wheel diameter. That subsection does not require one chock per wheel. If the unit includes a towing vehicle and a trailer, each vehicle counts for this provision. The prompt excludes transport exempt from this requirement.
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One chock for every wheel of the vehicle.
Always four chocks per vehicle, regardless of configuration.
One suitably sized chock per vehicle.
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