This intersection among others has stopped the whole city. Its a big city.
The leading trucks are just sitting. This constantly leads to a gridlock.
If the purple truck would just go, the whole city would eventually start moving again. This happens at many intersections. Trucks will just sit in the middle of the intersection and block the rest of the grid.
I see that there has been checks put in place and trucks are removed if they are in intersections, but it seems if a lane has an intent to go even if there is no space, the rest of the traffic will not go. This seems to resemble always having a green light until there is no traffic left in the lane.