Each driver is graded according to past results, their roof or wing painted accordingly. Red roofs with amber flashing lights are known as 'superstar' grade; then red (star), blue ('A' grade), yellow ('B' grade) and white ('C' grade). Every month during the season, the list is recompiled based on points scored at that month's meetings, and drivers move up and down according to their latest position. There are restrictions on movement down the grades based on limited meetings raced at, and the previous highest grade reached. Novice drivers for their first three meetings are allowed to start at the back of the grid and show a black saltire on the rear cab panel, so that other drivers know to avoid deliberate contact with the new driver.