Which vehicles are permitted to pass other vehicles on their right side?

1. Correct answer: Vehicles driving on a bus lane.
2. It is only permitted when the roadway’s width exceeds 12 meters.
3. Only slow vehicles on an urban road.
4. Only motorcycles, when the roadway’s width exceeds 6 meters.

WhyA vehicle driving in a public transport lane that it is allowed to use may pass others on the right. A wide road or slow traffic gives no such right.