If a vehicle behind you is driving too close to you, you should increase the distance to the vehicle in front of you.
Increasing the distance gives you more time to slow down if the driver in the vehicle in front of you suddenly brakes. If you drive too close to the vehicle in front and are forced to brake quickly, there is a great risk that the vehicle behind you will crash into you.
You must always adapt your speed and distance to the vehicle in front according to visibility, road surface conditions and general traffic conditions. The driver in the vehicle in front must be able to brake hard at any time without any risk of you hitting their vehicle from behind.