There are drivable vehicles located in various places in Knox County.

Controls

You can start or shut off the engine with N. Pressing W inside the vehicle will also start the engine, if it is off.
You can get in or out of a vehicle by pressing E.
You can toggle the headlights by pressing F or L.
Pressing Q will sound the horn.
Pressing O will bring up the heater controls.
Pressing V will bring up the vehicle radial menu.
Pressing U will bring up the Vehicle Mechanics menu.

Vehicle Mechanics Menu

The Vehicle Mechanics Menu displays information about various components of the vehicle. It will tell you if you need to replace a certain part of the vehicle.

Installing/Uninstalling Vehicle Parts

To install or uninstall a vehicle part, you must have it in your inventory. While in the Vehicle Mechanics Menu, Right-click the part you need to install/uninstall and select Install or Uninstall, depending on your case.