Correct answer
For all those exceeding 6 metres in length.
When length exceeds 6 metres. The rule excepts chassis cabs. For motor vehicles covered by the general rule with a length no greater than 6 metres, side position lights may be optional; exactly 6 metres does not exceed the threshold. Width above 2.10 metres concerns clearance lights, a different device.
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For all those over 2.10 metres wide.
For none, since they are optional.
For all those exceeding 6 metres in length.
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