A little pre-travel mapping.

Before heading to the Tri-Cities (Richland, Kennewick, Pasco) Washington are, I spent some time comparing OSM data to Yahoo images. Most of my effort was spent aligning ways to the images, tagging bridges, adding ref= tags, and adding the "opposite" way for some motorways. I also spent time drawing parts of the PSC airport.

I don't really trust the "Richland Y" area. I'm not sure how far along the construction had progressed when the Yahoo images were taken.

Split ways and adjusted layer and bridge tags from Barstow, California to Water Rd.

Split some ways and tagged some bridges.

Split ways and tagged bridges at Soap Mine Rd.

Split ways and tagged bridges at Daggett-Yermo Rd / Ghost Town Rd

Dropped a bunch of unneeded nodes from the northbound way. Changed some ways to trunk to match the rest of the highway.

This just didn't look right when compared to the Yahoo image where it passes under I-40, so...

I disconnected Observatory Access Rd from an un-named way (that I can't see in the image), connected the two "Observatory" roads, and adjusted the nodes to follow the way visible in the Yahoo image.

Unknown street name, adjusted ways and (bridge and layer) tags. Part of westbound I-40 didn't exist, added it based on my track log.

West Flagstaff Interchange / W Route 66, adjusted alignments and (highway, ref, layer, and bridge) tags.

S Flagstaff Ranch Rd added motorway_links. Also adjusted alignments, and (ref, layer, and bridge) tags.