In some states, vehicle inspections include tests for emissions and safety. When performing a vehicle safety test, facilities will typically test: Car horns Seatbelts Braking systems Tail lights Headlights Vehicle tires Moreover, in some states, vehicle owners must submit their vehicles to carbon emissions or smog tests. This emissions test aims to determine if the vehicle is a gross polluter. In most areas, these tests are routine, and if a vehicle fails one or both of these tests, the owner may need to pay a fine and take their vehicle in for re-testing before they can drive it on the road again.