Ancillary track signal overflows

A signal overflow consists of crossing a signal with a closed appearance. This dataset shows the number of SPADs ("Signal Passed At Danger") on the accessory lanes of the network.
Passing a red signal is not always a source of danger.By analogy, it is easy to compare this problem with that of motorists who burn red lights, and thus expose themselves to a collision with vehicles entering the same crossroads. In the railway world, when a signal is exceeded, this crossroads is called ‘the first dangerous point’ from which the train which has crossed the closed signal may collide with another train.