Apparatus (10) monitors a railroad crossing (X) for the presence of an object (H, V, A) in the crossing. The apparatus determines if an object is of sufficient size to damage to a train (1) approaching the crossing, and provides an alarm (Sa) to an approaching train so it can be timely halted. This...http://www.google.fr/patents/US5825412?utm_source=gb-gplus-shareBrevet US5825412 - Video detection apparatus for monitoring a railroad crossing
Video detection apparatus for monitoring a railroad crossing
