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Originally Posted by aberdeen5698
The network effect benefits and raises traffic levels on all transit lines. You have to build a mix of intersecting lines in order to maximize the overall effectiveness of the transit system.
This is clearly demonstrated in the construction of the Broadway line, which will bridge the gap between the Broadway/Commercial Drive station o...
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You can't build just radial lines, and in fact the best network is a grid system that allows trips between any two Skytrain stations to be made with no more than one transfer.
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The thing is that they don't actually raise traffic levels on all lines. Bus lines parallel to the Canada line all fell in traffic after the Canada line opened because the Canada line drew traffic away from them.
Broadway facilitates cross town trips, but it's functionally a radial, since Central Broadway would be effectively part of the Downtown but for our downtown being defined by waterbodies rather than job concentrations. It's strength is that it connects to a lot of jobs in the centre of the region, rather than that people can make quicker transfer to the airport which is much more of a marginal use.
Now, it's true, you can't just build radial lines, but basically any region that's worth bothering with heavy transit is going to have an urban structure that draws a lot of people to a given point. Almost all rapid transit systems are, at the regional level, mostly radial, and while they may form something of a net through the very centre of the region, they're strongly biased towards the center. Most of the time those circumferentials get filled in with buses since they're lower demand, but particularly strong ones may warrant heavier investment. I just caution that this might not be the case. If you over invest in circumferential transit, you end up with the crushloads of the Yonge Subway