If the vehicle has fallen into a bush or crown of a tree, interaction with the vehicle is not possible. It is necessary to cut a bush or cut down a tree in order to gain access to a vehicle. But if the car got into the reeds, you will lose the opportunity to use the vehicle, there is no action - to cut or chop down the reeds.

+ 1.08 If the car somehow finds itself in the bushes, the body of the killed infected person will lie nearby - the exit or entrance to the car may be blocked.

I understand the purpose of blocking the exit and entrance of the driver at the vehicle, near the walls, next to the fence. But this should not apply to all objects that were next to the vehicle.
The player can at any time get a kick from the server, for any reason, the car without control of the player can be in the vicinity of any object and the player will lose the opportunity to use the car. Even if the player enters the car from the passenger side, he has no action to sit down the driver.