He he he...
Your opinions are yours and will remain in the voices of "dissent" against the Metro system for the DR, much like (again) the same voices that did try and wall the NYC system, Paris underground and God only knows how many other systems.
The Transmillenio reached the full capacity such solutions can offer short to mid term, if you didn't know that go and search a bit on the issue there and the recent efforts to bring the Metro there (oh! Just like SD).
You see? there's limited future growth that can be had with this system and the Colombian authorities behind it agreed! There's a limit to how many buses you can put in the road, before it all becomes gridlock...
Not only is it the most expensive ride of public transportation in the city it serves, but the one facing the worst possible problems due to the need to expand and accelerate frequency to what the laws of safety allows.
This BRT has been praised a lot (by Colombians and others) since it came to be on the dramatic transformation the city underwent when it entered operations. But now, years later, those same praises have turned into worries as a many see the BRT system to be struggling under its own dramatic success story.
The cost of fuel have increased, tires have need to be replaced on a more frequent pattern, adding millions of US$ to the costs or operation. The overwhelming amount of riders is taking a toll on the platform as it was not intended to be so taxed as it's now. Safety has been compromised in several occasions with accidents being more frequent than not, even between buses and rider's getting hurt.
The ColombianTransmilenio is a great BRT system and does a so so job instead of a metro system...
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You should ask Colombians what they think would be the best the Transmilenio or a Metro and I bet you the majority would tell you a Metro would be God sent! Some people have to wait for long periods just to board ONE bus to head to work in the morning and the same going home. No matter how fancy you make the buses or long, the capacity is NOT there to meet demand!
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