what do they check at car inspection
In the United States, performing vehicle inspections is actually optional. For example, one does not need a vehicle inspection in New Jersey. However, emission inspections are mandatory nationwide. What is checked varies from state to state. For example, in Massachusetts, the following is checked (not an exhaustive list): brakes, windows, shocks, steering, exhaust, all lights, restraints. For more information see: http://www.vehicletest.state.ma.us/about_whywhat.html and http://www.ask.com/wiki/Vehicle_inspection#United_States.