You have mounted twin tyres on your truck tractor. What must you remember?

Your answer is correct because according to German traffic rules, when twin tyres increase the width of a truck tractor, certain safety measures must be taken. First, if the tyres extend more than 40 cm beyond the existing lights, additional lights must be mounted on the outer edges to ensure visibility in darkness. Second, if the total width including the twin tyres exceeds 2.75 meters, the excessive width must be marked with warning plates to alert other road users. The third option is incorrect because the width can legally exceed 2.55 meters with twin tyres, but this must be properly marked. Remembering these rules helps ensure safety and compliance when using twin tyres on large vehicles.