Signal advance on main tracks

A signal passed at danger is the passing of a signal with a closed appearance. This dataset contains the number of SPAD (" Signal Passed At Danger ") on the main tracks. A signal pre-passing certainly does not systematically lead to a dangerous situation. By analogy, it is easy to compare this problem to that of motorists driving through a red light, exposing themselves to the danger of collision with vehicles entering the intersection. In the railway world, when a signal is passed, this intersection is called "the first danger point", from where the train that has passed the closed signal can collide with another train.