Related Photo Galleries
Some tracks assign a car/class number during the technical inspection, while others have you take your tech card to another location (often the main timing tower/office) to be issued a number. The number you are given will need to be displayed on your car. It's common practice to place the number on the side of the car that faces the tower as well as the back window of the car. Placing it on the front glass is optional for most test-and-tune nights. Make sure the numbers are large and legible for the track officials. You can use shoe polish but there are several window marker products available that do a better job, or you can get static cling numbers.