When are we not obligated to drive a private passenger car in the right lane?

1. When another vehicle overtakes us from the left.
2. When you pass another vehicle from its right side.
3. Correct answer: When the right lane is designated for another type of road users (e.g. public transportation lane).
4. When another vehicle that is driving on the left side of the road signals about its intention to start drive.

WhyA private car may drive outside the right lane if the right lane is given to others, for example public transport.