Correct answer
By means of a light-signalling device with one or more amber lights.
Using the V-2 signal with one or more amber lights. It warns of the position of a vehicle working on or near the road under Annex XI conditions: stopped, parked or moving at no more than 40 km/h. It helps warn of an obstruction but does not guarantee safety or grant emergency-vehicle priority. The light must meet approval and visibility requirements; the specified reflective markings may be added.
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By means of a light-signalling device with one or more blue lights.
By means of a light-signalling device with one or more amber lights.
By means of a light-signalling device with a rotating blue or red light.
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