railroad crossing signs are railroad crossing signs, a baby could figure that one out.
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.
Usually local ordinances.
In North America, they're round.
An X. Because it is a cross for the railroad crossing.
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 purpose of a railroad crossing sign, is to let you know that there is a railroad coming up or that there is one right in front of you.
The Transcontinental Railroad
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.
Be happy and think then you will get the answer
level crossing = railroad crossing