[alistairSH]

This was a special/unexpected situation - one of the other passenger jets declared an emergency and needed to evacuate the passengers onto the ground (there were no free gates to return). The firetruck was on it's way to assist with the emergency.

[thefounder]

Yeah but why there was not red alert on all the monitors when both the airplane and the truck had green light on the same runway ? That’s the minimum of automation that I would expect, ideally sync-ed to all the participants(truck drivers, pilots etc). It would not have been hard for a system to predict the collision given it had all the data (positions of each participant + the route of each).