More about 18 Wheels of Steel Extreme Trucker game rules you can read on 18 Wheels of Steel Extreme Trucker official site.
|Throttle||Up Arrow, W|
|Brake/Reverse||Down Arrow, S|
|Steering Left||Left Arrow, A|
|Steering Right||Right Arrow, D|
|Shift Up (manual)||Left Shift or Right Shift|
|Shift Down (manual)||Left Ctrl or Right Ctrl|
|Show / Hide Info Screen||F1|
|Show/Hide Wing Mirrors||F2|
|Show / Hide On-Screen Dashboard||F3|
|Free Rotate Camera||2|
|Rotate Camera||Left Alt|
|Look Left||Mouse Left or Numpad /|
|Look Right||Mouse Right or NumPad *|
|Look Down||Mouse Down|
Note: Some of the above keyboard actions (such as Steering Left or Steering Right) may be overridden by additional controllers (joystick, gamepad, wheel etc.) and may no longer function.
If you select a controller other than keyboard (in the combo box at the top), you are automatically switched to the controller's settings. You should setup the controlling device properly right away, otherwise it will not work in the game. You can switch between the controller and key settings any time by pressing the button in the lower left corner of the controls settings screen. Caution, certain keyboard controls (especially related to steering) may become disabled as they may be overridden by the additional controller.