Seems to me that no one on the West Coast cares about highway improvements, and that dates back to the 1960s freeway revolts that took place in Portland, San Francisco, L.A. and Seattle. At least this time that perception may change if tolls are accepted, but don't hold your breath.
I moved from Massachusetts to SoCal 21 years ago. They're
constantly widening roads around here, and even building some new freeway segments. CA-58 Bakersfield, Mojave, Kramer Junction, and Hinkley; CA-210 east of San Dimas; CA-52 east of CA-125; CA-125 south of CA-94; CA-905; CA-11; CA-78 around Brawley. I'm sure north and central California is the same.
When I go back to visit Boston, it's like a time warp. Cloverleaf interchanges still abound; flyovers are almost unknown outside of the city. They finally widened the middle part of 128 to eight lanes, where I remember everyone driving in the breakdown lanes in rush hour back in 1971. Aside from the Big Dig and a bit of US-44 in Plymouth, what freeways have they built around there?
As to the NW, Washington seems to be a lot more interested in freeway building than Oregon.