2 ptsPTOfficial number: 4113
What is the purpose of the drive lock circuit ("green line")?
Explanation
Correct answer: It prevents the tram driving with open (half-open) doors.
The drive interlock circuit, colloquially known as the 'green line', is a fundamental safety system in a tram, protecting passengers. Its function is to prevent the vehicle from moving off until all the doors are fully closed. This prevents dangerous situations, such as a passenger being trapped or falling out when moving off from a stop.