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Most highway-railroad grade crossings are activated by what is called a track circuit that senses the train as it approaches the crossing and then also knows when the train has moved clear of the crossing and shuts off the signals.
railroad crossing signs are railroad crossing signs, a baby could figure that one out.
An X. Because it is a cross for the railroad crossing.
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
Be happy and think then you will get the answer
level crossing = railroad crossing
railroad crossing sign
Railroad crossing
On average there are 430 people that dies due to railroad crossing each year. There are approximately 4,900 people that are injured at railroad crossing as well.
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.
When within 100 feet (about five car lengths) of or crossing an intersection or railroad crossing.