Railroad crossings are marked with one or more of the following special warning devices:
• Round Advance Warning Sign — A yellow sign with a black “X” and the letters “RR” means a highway-railway crossing is ahead. The sign may be placed up to 750 feet in advance of the railroad crossing.
• Pavement Markings — A solid yellow line in advance of the crossing means no passing. White stop lines on each side of the track show motorists where to stop when a train is approaching. These markings also indicate a highway-railway crossing is ahead.