I’ve been through that area by Vancouver. It is notorious.
A lot of ticket avoidance is spending most of your time on roads you are familiar with and knowing where the likely traps are. It used to really irritate my stepson when we’d be hitting 90 on I-90 and I would say, “This looks like a good place for a speed trap” before we got out of the mount Baker tunnel. I’d back down to the actual limit and, whadaya know, there is a radar cop. But I know it is a notorious site.
I-40 in Arkansas between Brinkley and Forrest City, guaranteed there will be a state smokey on the road all the time.