Since 1954, American automobile manufacturers have used a vehicle identification number (V.I.N.) to describe and identify motor vehicles. The early VINs came in a wide array of configurations and variations, depending on the individual manufacturer.

Beginning with model year (MY)1981, the National Highway Traffic Safety Administration required that all over-the-road-vehicles sold must contain a 17-character VIN. This standard established a fixed VIN format. Vehicle Identification Numbers (VINs) are used to uniquely identify motor vehicles. Prior to 1980 there was not an accepted standard for these numbers, so different manufacturers used different formats. Modern day VINs consist of 17 characters that do not include the letters I, O or Q.