Correct answer
When its width exceeds 2.10 metres.
On a lorry, end-outline marker lights are compulsory when width exceeds 2.10 metres; fitting is optional between 1.80 and 2.10 metres. They are white at the front and red at the rear. Fitting requirements are separate from use: switch them on at night, in substantially reduced visibility and in tunnels or underpasses.
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When its width exceeds 1.90 metres.
When its width exceeds 2.10 metres.
When its height exceeds 4 metres.
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