Road users’ safety at railroad grade crossings (RRGCs) is one of the most demanding concerns, because the majority of RRGC accidents are fatal in nature. These accidents are mainly caused by collisions between road users and trains, principally due to road users’ violation. In general, road users commit violations either individually or in groups. Moreover, they have a pattern of committing violations regularly or only on occasion, and a fraction of them may be nonviolators.