Prioritizing

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Hello,
recently ive been thinking of some new features for the game, and the only one someone else has not mentioned is the ability to prioritise lines. So if i have a metro system with a ring line, that needs to always be on time and fast, then i want that train to always have higher priority over lets say, a connection train coming in from the suburbs or smth. This would work out by adding one of lets say three priorities to a line, high, normal and low, so i can set the ring line as the high priority line, so that it always gets to the station, even if other trains are made to wait longer. Im guessing that even in the real world transportation managment, some lines are given bigger priority over other to enter the station. Sorry for bad english, aint from the UK

 

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I would think that designating a line "Express" would give it priority.
But, as you may know from the existing game mechanics, this is not possible. If you closely observe vehicles at any intersection, the game simply keeps track of when the vehicle enters the queue.... and it lets the vehicle that has been waiting the longest go first. There is not "logic" or processing being done at each and every intersection. I highly suspect that most people's home computers would not have the processing power to reasonably do this across the size of the cities involved. Of course I could be wrong... and it entirely depends on how things are coded underneath. But adding things like that would not be trivial. It would require a complete revamp of how traffic is currently handled.
This goes for all the requests on the forums we see for traffic lights and things like that. It's not trivial to just plot them into the game.