When is there a risk that the front wheel of the motorbike will lose contact with the carriageway?

The combination of choices 1 and 2 correctly identifies situations where the front wheel of a motorbike might lose contact with the road.

1. Accelerating in a low gear can cause the front end of the bike to lift due to the torque being applied. This is especially true for powerful bikes or when a rider shifts their weight backward during acceleration.

2. Carrying a pillion passenger can also shift the weight distribution on the bike, potentially lifting the front wheel during acceleration. The added weight in the back can change the balance and handling dynamics of the motorcycle.

Choice 3, braking using the front-wheel brake, does not contribute to the risk of losing contact with the ground in the same way. Although heavy front braking can lead to a loss of traction, it is not a direct cause of the front wheel losing contact like the other two scenarios.

Understanding these dynamics is important for safe riding as outlined in German traffic regulations, which emphasize maintaining control and stability of the motorcycle at all times.