"A fundamental goal of each transit system is to provide passengers and employees with the highest level of safety that is practical and consistent with the mission of the transit system. Accomplishing this goal with any degree of efficiency requires a transit system to develop and implement a comprehensive safety program. This program should address the three primary safety functions of a transit system, which are as follows: to prevent the occurrence of accidents, to respond to and recover from accidents, and to learn from accidents that have and do occur. This document, prepared under the sponsorship of The Federal Transit Administration (FTA), provides guidance on how to develop and implement an accident prevention program for urban, rural, and specialized transit systems."
Federal Transit Administration: http://transit-safety.volpe.dot.gov