Under which conditions is it allowed to deviate from a driving lane?

1. At a slow speed and by deviating sharply.
2. Correct answer: Provided that no risk or disturbance is caused to any other road user.
3. Only after signaling and looking at the mirrors.
4. It is absolutely prohibited to deviate from the driving lane.

WhyYou may change lanes when you don't endanger or disturb anyone. Mirrors and the indicator are needed, but they give you no rights by themselves.