at the wheel
Put your hands on the steering wheel.
Dava pra botar o menino um pouquinho aí no volante?
Could you let the boy get behind the wheel for a little while?
— Central do Brasil (1998)
Tom dormiu no volante e causou um acidente.
Tom fell asleep at the wheel and caused an accident.
Tinha uma garotinha no volante.
There was a little girl at the wheel.