Yes, the reservation stops at the WA/ID border a few miles to the east. This area is known as the Palouse. A LOT of wheat is grown here.
SR 195 connects Spokane(biggest city east of the cascade mountains) and Pullman, home of Washington State University, so this road gets major traffic.
This is a 2 month job, so I will be posting more video and info about it.
And I do expect to get some road rage video, but as I said to zekepickleman, hopefully not fatal.