Correct answer
The blue V-1 priority-vehicle warning light.
The blue V-1 priority-vehicle signal: Annex XI of the General Vehicle Regulations prohibits its installation and use on non-priority vehicles. Reversing lights and direction indicators operating as hazard flashers are regulatory car lighting devices. Do not confuse the blue priority signal with an ordinary private car’s lighting.
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Direction indicators operating as hazard flashers.
The reversing light.
The blue V-1 priority-vehicle warning light.
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