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Vehicle inspection is a procedure mandated by national or subnational governments in many countries, in which a vehicle is inspected to ensure that it conforms to regulations governing safety, emissions, or both. Inspection can be required at various times, e.g., periodically or on transfer of title to a vehicle. If required periodically, it is often termed periodic motor vehicle inspection; typical intervals are every two years and every year. When a vehicle passes inspection, often a sticker (inspection decal or inspection sticker) is placed on the vehicle's windshield or registration plate to simplify later controls, but in some countries such a Netherlands since 2008 is not necessary anymore. Inspection stations are places to drive inside to see if a vehicle passes inspection once a vehicle is due for inspection. Most US inspection decals/stickers display the month's number and the year.
In some jurisdictions, proof of inspection is required before a vehicle license or license plate can be issued or renewed. In others, once a vehicle passes inspection, an inspection decal is attached to the windshield or registration plate, and police can enforce the inspection law by seeing whether the vehicle displays an up-to-date decal.
There is some controversy over whether periodically inspecting motor vehicles is a cost-effective way to improve road traffic safety.
In the United States, each state government is free to decide whether to require vehicle safety inspection, as well as the specifics of the inspection program. 18 states have a periodic (annual or biennial) safety inspection program, while Maryland requires an inspection prior to registration or transfer of ownership only. Several states have abolished their safety inspection programs in recent years, claiming that these programs do not reduce accidents and are merely a tax on vehicle owners.
Under the Clean Air Act (1990), states are required to implement vehicle emission inspection programs in metropolitan areas whose air quality does not meet federal standards. The specifics of those programs vary from state to state. Some states, including Florida, Kentucky and Minnesota, have discontinued their testing programs in recent years with approval from the federal government.[citation needed
In some states, inspections are done at state-operated inspection stations. In other states, privately owned garages perform the inspections with approval from the state.
For Trailer or trucks inspection requirements visit Texas Departament of Public Safety