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For a heavy rigid vehicle whose rear-most axle is a non-steering axle, the maximum rear overhang permitted including its load is the lesser of:
For the heavy rigid vehicle described, maximum rear overhang is the lesser of 4 metres and 70% of the wheelbase.
Related guidance
Measure from the rear axis to the back of the vehicle or load, whichever is further back. Both limits apply; you cannot choose the larger figure.