These are the options in the Gameplay menu in Euro Truck Simulator 2:

You can completely reassign the control keys through “Options” -> “Keyboard” menu

The following controls are reassignable: Throttle Brake / Reverse, Steering Left, Steering Right, Shift Up, Shift Down, Start / Stop Engine, Parking Brake, Motor Brake, Left-Turn Indicator, Right-Turn Indicator, Hazard Warning, Light Modes (Headlights), Horn, Wipers, Cruise Control, Interior Camera, Chasing Camera, Top-Down Camera, Roof Camera, Lean Out Camera, Bumper Camera, On-Wheel Camera, Drive-By Camera, Next Camera, Show/Hide On-Screen Side Mirrors, Toggle Route Advisor Modes, Route Advisor Mouse Control, Activate, Attach / Detach Trailer, Screenshot,

Default controls are:

Eurtrucksimulator2controls.jpg