When is a vehicle driver required to drive on the road shoulder, when the shoulder is paved with asphalt and clear, in order to allow another vehicle to overtake him?

1. AWhen the driver is driving very slowly - for any reason whatsoever.
2. BNever. Driving on the shoulder is forbidden, therefore a vehicle that holds up the traffic behind it will deviate to the road shoulder and stop in order to release the traffic behind it.
3. COnly when the vehicle is driving on a steep incline and is forced to drive slowly and obstructs the free flow of traffic.
4. DWhen the driver of a motor vehicle is forced to drive at a low speed, which holds up the traffic behind him, due to his load or due to the gradient of the road.

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