Safety helmet and vehicle system, circuit and device

There is provided a system for enhancing safety of a vehicle for which an operator wears a helmet, the system comprising an RFID device comprising an RFID tag and an RFID reader adapted to detect whether the helmet is within a proximity distance from the vehicle and to output a first helmet status signal; a helmet presence detector adapted to detect whether the helmet is being worn by the operator and to output a second helmet status signal; and a circuit for receiving safety conditions signals comprising the first and second helmet status signals and for activating an ignition system of the vehicle when safety conditions are detected, the safety conditions comprising when the helmet is detected to be concurrently within the proximity distance and worn by the operator. There is also provided a safety circuit and helmet device.