Usually local ordinances.
railroad crossing signs are railroad crossing signs, a baby could figure that one out.
A passive crossing is marked by signs, pavement markings, and sometimes flashing lights or gates to indicate the presence of a railroad crossing. Drivers must stop and yield to oncoming trains.
Railroad crossing signs are either a white x shape with the words railroad crossing inside of them or a yellow circle with a black x and the letter R on the left and right side.
A large X, referred to as a crossbuck.
In North America, they're round.
The road sign is a large yellow circle with a black X across the circle. The railroad can also erect their own RR crossing warning signs which consist of a two planks of wood (or other material) configured into a shallow-X or "crossbuck" style sign. These warning signs are painted white with the words "rail road crossing" stenciled on them in black letters.
The sign stands for "Whistle Crossing". Many of these signs say "Begin WX" with the word begin on top of the WX. The sign also instructs the engineer where to start blowing his whistle. Engineer blows standard crossing sequence. Long, Long, short, Long.**ACTUALLY** to answer your question accurately, "W" signs stand for Whistle (for single Crossing). "WX" signs means Whistle for multiple crossings. Straight out of the NORAC railroad rulebook.
A Cross-buck *Added - These signs, with the words RAIL ROAD CROSSING, are required at nearly all publc highway-railroad grade crossings in the US, and are generally mounted within 20 feet of the actual crossing. In Canada, a set that is white with red border is replacing the US type.
A black and yellow circle that has a R on the right, and a R on the left with an X in the center of the circle. Page 5-18There normally arn't if you're driving, its a hazard sign which is a triangle with a red boarder marking a level crossing that tells you you're near train tracks (UK)In the US, it is elevated cross arms in the shape of an X, white, with STOP, LOOK, LISTEN painted on them. The crossing MAY have flashing red signal light, and MAY have an automatic arm that blocks the roadway.
Location: School control typically refers to a school crossing where a crossing patrol officer assists pedestrians, while a pelican crossing is a type of pedestrian crossing with traffic lights to regulate the flow of vehicles and pedestrians. Control mechanism: School control relies on the presence of a crossing patrol officer who manually stops traffic to allow pedestrians to cross, whereas a pelican crossing uses traffic lights to control the flow of vehicles and pedestrians. Visibility: School controls are often marked by signs and flashing lights to indicate the presence of a school crossing patrol officer, while pelican crossings are visually marked with yellow stripes on the road and pedestrian signal posts.
Any grade crossing that has no warning devices, signs, or anything... or even one that is malfunctioning has the train stop or slow down for it. A conductor will either get off and flag the crossing by stopping cars and letting the train through with a flag or a flare will be lit and cast into the roadway. The horn, of course, would be honked as normally.
Shaped like an X