Where is parking prohibited?

Parking is prohibited at the edge of the roadway if it prevents others from using designated parking areas because this would obstruct traffic flow and limit available parking options for other vehicles. Additionally, parking before sunken kerbstones is also prohibited, as it is intended to ensure that pedestrians can safely cross the road without obstacles. Both of these rules are established to maintain safety and accessibility on the road.

By selecting the correct combination of options 1 and 2, you demonstrate an understanding of these important regulations that help ensure the efficient functioning of roadways and the safety of all road users. Option 3, on the other hand, refers to a different context and is not relevant to the specific question about prohibited parking areas.