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For a standard-width vehicle, how much extra width beyond the normal maximum is allowed solely for load-securing fasteners?
No extra width is allowed solely for load-securing fasteners: the allowance is 0 mm.
Related guidance
Fasteners must fit within the applicable width limit. Exclusions for specified mirrors, lights or hubodometers do not extend to them. The usual maximum is 2.55 metres; permitted overdimension operations are outside this question.