btw, spd, I’ve had to get off I-10 in PHX numerous times on my way to Flagstaff due to huge hour-plus eastbound traffic jams (Flagstaff is often my overnight locale when heading to the CO rockies). I usually get off around the 59th St exit and go at least 14 miles north on the surface street and get on the I-17 in Glendale or thereabouts.
I have found that the north-south thoroughfares on the west side of town are straight and lie in a grid. And I don’t have a road map of PHX and my vehicle will be 22 years old this June :=0