Car

The car is a car that does not drive or operate like a car, so it might not actually be a car. It was added in update v1.10 to The Forest.

Gameplay
The car seems to be a decorative prize if you choose the game ending in which you did not save Timmy. This ending means you are not going to kill other people or bring them into this nightmare to save your son

This may be a result of the main character realizing that he will not be able to rescue his son ( by escaping the island ) - and succumbing to loneliness and/or insanity.