When approaching an intersection, bridge, or railroad crossing, you should never drive (pass on the left half of the roadway when within: ?

You should not go into the left side of the roadway when within 100 feet of the crossing. Moreover, you should also turn on your turn signal when within 100 of a turn. These precautions prevent accidents as it makes clear to other drivers what your intentions are and drivers making turns are not endangered. 

No it doesnt because it can be any number.