When you're changing lanes, how should you observe the surrounding area?

In the photo you are riding on a two-lane roadway in town; a blue sign on the right warns that the right lane ends and you have to move to the left one. When changing lanes, you look in the mirrors and turn your head slightly to eliminate the so-called blind spot - answer C.

The Road Traffic Act states that the driver of a vehicle may change lanes only while exercising particular caution and must give way to a vehicle travelling in the lane he intends to move into. The mirrors of a motorcycle show the road behind, but they have a blind spot - an area right next to you and behind your shoulder, where a whole car can fit. Looking in the mirrors alone (answer B) does not reveal it. On the other hand, turning your head for a full look backwards (answer A) takes away your view of the road ahead for a few moments and turns the handlebars. That is why you combine both methods: first the mirrors, then a quick glance over your shoulder towards the lane you are moving into, the indicator early enough, and only then a smooth lane change. In the photo you plan the move to the left lane in advance, before the right lane ends.

Legal basis: Art. 22 para. 1, para. 4 and para. 5 of the Road Traffic Act (Prawo o ruchu drogowym)