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Originally Posted by somethingfast
Okay so I really don't understand why they are building I-11 pretty much parallel and not that far from I-10...what's the point? Why not just widen I-10??? Can anyone give me some insight as to this rationale ? 
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I can think of a few reasons...
This portion of I-11 was supposed to be part of the I-10 alternative route plan to allow truckers to bypass Tucson.
Also, I-11 is supposed to contain a rail element as well - so I only suppose that they wanted a new corridor where they didn't have any existing constraints to deal with.
And finally, I'd imagine that sometimes this also has to do with where they can get the land as well - additional right of way along I-10 could be difficult - especially through urban areas like Tucson. Seems a lot easier to route it through state land where there is zero existing development or people in the way.
Personally I think just widening I-10 to carry the capacity they want on I-11 would make it a nightmare of a freeway to drive. It's already pretty congested as it is. Adding more lanes isn't going to solve that problem.