What can increase the risk of a motorcycle fall while driving through road bends?

The selected combination of options refers to potential hazards that can lead to motorcycle falls when navigating bends in the road.

1. An oil spill on the carriageway can make the surface slippery, drastically reducing tire traction, which is crucial for maintaining control during a turn. This is particularly important for motorcyclists, as they are more vulnerable to loss of traction compared to vehicles with four wheels.

2. A bump on the carriageway can disrupt the motorcycle's stability, especially during a bend where maintaining balance is vital. Bumps can cause the tires to lose contact temporarily, leading to a risk of falling.

Both of these conditions are critical to consider under German traffic regulations, which emphasize the importance of road safety and awareness of hazardous situations. Identifying and understanding these risks help motorcyclists make safer decisions on the road, ultimately aiming to prevent accidents.