Quote:
Originally Posted by Mikey711MN
If anything, M1EK, this observation substantiates the invalidity of the argument that a city can build their way out of congestion. IIRC, the majority of roads built in that area per the passed Proposition were loops and spurs that facilitated growth in the far flung regions (that are now being developed).
To that end, I-10 and I-17 (if I've got those numbers right) were and are the main arteries in Phoenix, and they have not been substantially developed in the last few decades, ergo my suspicion is that the strain on those roads has increased. This is, of course, my interpretation of the situation.
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IH10 has had a lot of upgrades including new lanes, a tunnel through central Phoenix, and HOV lanes. I think IH17 is getting a lot of upgrades now. You are correct that most of the new roads with the exception of the 51 connected newer areas of the region. 51 relieved a lot of pressure on N/S traffic in the valley. Yes, traffic on IH10 and IH17 is, well, a lot like traffic in LA, but Phx is really a lot more like LA than it is Austin.