In which cases should you apply the brakes only very carefully?

The selected combination of answers is correct because each situation presents specific hazards that require careful braking to ensure safety.

1. On roadways with loose chippings or sand, applying brakes too hard can lead to loss of traction and control of the vehicle.
2. On tram tracks, sudden braking can cause skidding or instability due to the slick surface, which may not react the same way as standard pavement.
3. When driving for the first time with new tyres, those tyres need to be "bedded in" properly. Sudden hard braking can affect the wear pattern and grip of the new tyres.

These considerations are crucial according to German traffic regulations, which emphasize the importance of maintaining control and ensuring the safety of all road users. Proper awareness and response in these situations can prevent accidents and enhance overall road safety.