The theory section is all the theory required to pass your drivers license. Its important to combine theory with practical driving practise.

(A38-2) Distance to level crossing

The signs indicate the distance to a level crossing in a three-bar system. The sign with the three bars is, except for in densely populated areas, erected under one of the following signs; A35, Level crossing with gates, A36, Level crossing without gates, or A37, Junction with tramway line. The sign with two bars indicates that it is two-thirds the distance to the level crossing and the sign with one bar indicates the last third of the distance.