Active Safety Interlocks in Public Transit: A Mechatronic Approach to Preventing Passenger Fall Accidents in Semi-Urban Bus Networks

This paper addresses the critical issue of passenger fall accidents in public transit, particularly within semi-urban bus networks, which frequently result from premature vehicle movement. We propose a novel mechatronic active safety interlock system designed to prevent such incidents. The system integrates ultrasonic sensors for precise footboard occupancy detection and robust solenoid-actuated door locks. A core innovation is the electronic tethering of the vehicle’s ignition and acceleration mechanisms to both the door’s fully closed status and the confirmed absence of passengers on the footboard. This quantitative engineering study explores the system’s design, implementation considerations, and mathematically models the expected reduction in accidental falls. Rigorous analysis demonstrates significant safety improvements by ensuring buses remain stationary until all passengers are clear, thereby enhancing public safety and operational reliability. The findings provide a compelling case for adopting advanced interlock technologies in modern transit systems.