What can cause unnecessary obstructions?

The selected combination correctly identifies all scenarios that can lead to unnecessary obstructions on the road.

Stalling the engine in dense traffic can create a sudden stop, which disrupts the flow and may lead to accidents. Vehicles proceeding too slowly without a valid reason can cause frustration among other drivers and may lead to dangerous situations as drivers attempt to overtake. Lastly, motor vehicles that break down due to running out of fuel not only become immobile but also require emergency measures to be removed, further obstructing traffic.

According to German traffic laws, all drivers must ensure their vehicles are roadworthy and should avoid actions that lead to congestion or potential hazards for others on the road. Implementing these rules helps maintain safety and efficiency in traffic.