What could be the cause of interrupting the drive during start-up if the internal bell rings and there is no indication of closed doors?
Show the correct answer
Correct answer
B. Emergency opening of the door by a passenger.
Explanation
This question is about driving being interrupted during start-up when the internal bell rings and there is no closed-door indication. The cause may be emergency opening of the doors by a passenger - the answer is B.
A tram has an interlock that does not allow it to run with open doors. When a passenger uses the emergency door opening, the system interrupts the start-up, and the tram driver gets an audible signal and the door-closed indicator light goes out. The tram driver must then stop the tram, check what has happened and make sure that nobody has fallen out or been trapped by the doors. Opening a window (answer A) does not affect the door interlock, and a blown converter fuse (answer C) would give different symptoms.
Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)