When is overtaking on the right permitted?

Overtaking on the right is permitted when the vehicle being overtaken is turning left. This is because, in such situations, the vehicle is safely moving into another lane to execute a turn, allowing other vehicles to pass on the right without violating any traffic laws. This maneuver helps maintain the flow of traffic and can prevent potential hazards that might arise from a vehicle delaying the overtaking process as it prepares to turn left.

In contrast, overtaking on a two-lane road is generally not permitted because it can lead to unsafe conditions, especially where visibility is limited. Overtaking due to an obstruction on the left may not always be advisable since it may not follow the proper traffic regulations designed to ensure safety. Lastly, rainy conditions do not inherently allow or prohibit overtaking on the right; instead, they require drivers to exercise greater caution and reduce speed due to decreased visibility and road traction.