2.15.2 – Warning Signs and Devices Advance Warning Signs. The round, black-on- yellow warning sign is placed ahead of a public railroad-highway crossing. The advance warning sign tells you to slowdown, look and listen for the train, and be prepared to stop at the tracks if a train is coming. All passenger and hazmat carrying vehicles are required to stop. See Figure 2.15. Figure 2.15 Pavement Markings. 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. See Figure 2.16.
Figure 2.16 There is also a no passing zone sign on two-lane roads. There maybe 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.