If you go straight in a tractor with a trailer, what should you see in properly-adjusted external mirrors?
Show the correct answer
Correct answer
B. The area behind the combination vehicle, on both sides, and the edge of the trailer.
Explanation
In the photo, an external mirror on an arm behind the window is seen from the tractor cab. Correctly adjusted mirrors show the space behind the vehicle combination on both sides and the edge of the trailer - answer B.
A mirror is adjusted so that a narrow strip of the side of the trailer can be seen at its inner edge, and the rest shows the road area behind the combination and next to it. The edge of the trailer gives you a reference point - you know where your combination ends and how much space is left for an overtaking car or a cyclist. The side of the tractor and the front of the trailer in the middle of the mirror (answer A) is a waste of the field of view: you see your own vehicle instead of the traffic behind it. The drive wheel of the tractor (answer C) tells you nothing about the situation on the road. The rules on the technical conditions of vehicles require mirrors that allow you to see the road behind on both sides of the trailer being pulled. Adjust them while stationary, with the combination straight, sitting in your normal position.
Legal basis: § 46 para. 1 point 1 letter d of the Regulation on the technical conditions of vehicles and the scope of their necessary equipment