If there is a white line painted on the pavement before the tracks, you must _________.

Pavement markings mean the same as the advance warning sign. They consist of an X with the letters RR and a no-passing marking on two-lane roads. There is also a no passing zone sign on two-lane roads.
There may be a white stop line painted on the pavement before the railroad tracks. The front of the school bus must remain behind this line while stopped at the crossing.