Correct answer
No, they must be authorised and meet applicable requirements.
No. Article 15.5 of the General Vehicle Regulations prohibits lights beyond those authorised and unauthorised luminous or reflective paints or devices, subject to cases and conditions in its annexes. This does not prohibit every compliant optional light merely because it was not factory-fitted. A modification must meet approval requirements and, when applicable, the vehicle-modification procedure; it is not always handled by requesting prior DGT authorisation.
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Yes, any extra light is legal even if unauthorised.
No, they must be authorised and meet applicable requirements.
Yes, reflective equipment may always be installed without regard to regulations.
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