For more control, you can manually edit game files to change road speed limits so you don't get fined:
Turn off fatigue and damage if you plan on "testing" walls. euro truck simulator 2 speed mod 200 km h better
If you love hardcore economy, realistic fatigue, or driving older trucks, 200 km/h will feel absurd. You will crash. You will fail deliveries. The police will fine you into bankruptcy. For more control, you can manually edit game