Just turn AZ 95 into the new Interstate. It already runs from San Luis AZ to Nevada. All you have to do is widen it. The only Interstate serving SW AZ is I-8. A North/South interstate through Yuma would help the economies of Yuma County, La Paz County, and Mojave County immensely. We could get rid of the excuse our politicians constantly use to explain why they don’t attempt to attract any business that isn’t a restaurant or retail.
Interestingly when this was presented on KOLD last night it was talked about “as faster way to Vegas”...:^)
I say just widen I-10.