A Radio Based Intelligent Railway Grade Crossing System to Avoid   Collision
  Railway grade crossing is become the major headache for the transportation system. This paper describes an intelligent railway crossing control system for multiple tracks that features a controller which receives messages from incoming and outgoing trains by sensors. These messages contain detail information including the direction and identity of a train. Depending on those messages the controller device decides whenever the railroad crossing gate will close or open. 
Sheikh Shanawaz Mostafa, Md. Mahbub Hossian, Khondker Jahid Reza and   Gazi Maniur Rashid
cs.SY