Level Crossing Modelling Using Petri Nets Approach and Π-Tool

This paper presents a holistic approach in level crossing safety modelling through the use of Petri nets. A Petri net is capable of dealing with multiple sequences which involve hardware, software and human failures in complex systems. This paper begins with the motivation towards the new modelling approach assessing safety risks in a level crossing. Researches around the world related with level crossing safety risks were first reviewed and highlighted. The paper then presented the research methods, safety modelling and analysis used in the study. Π–tool, which is based on the Petri nets approach, was used to build the model. The model was tested at ten critical level crossing locations in South Australia. The first model was developed using the signal failure as the accident mechanism. Results show that the rate of potential accident occurrence at selected locations is very close to the actual rate of accidents. The Π–tool appears to be a suitable tool for assessing safety and performance at level crossings.