Washington (and Oregon) Roads of the Future:
I-905: Bellingham, WA to Sumas border crossing into British Columbia. Continues on the Canadian side to link with Trans-Canada Hwy 1, a freeway. This freeway provides a more direct corridor to move goods and traffic from central BC and Alberta to ports in Bellingham and Seattle.
I-605: The Puget Sound Metro Loop. McChord AFB, WA to Marysville, WA via the Maple and Snoqualmie Valleys. This loop corridor follows many already established freeway/highway sections of WA-512, WA-18, WA-202, WA-203 and US-2. Provides bypass alternative to the more urban I-5 and I-405.
I-505: Tacoma, WA to Hood Canal Bridge. Combines already established freeway sections of WA-16 and WA-3. Provides a federal highway to military interests on the Kitsap Peninsula.
Upgrade US-2 from Everett, WA to Wenatchee, WA. Super 2 with expanded freeway options and town bypasses. Current highway is a killer road. New road provides another safe route over the Cascades.
I-9: Extend I-82 from Ellensburg, WA over Mission Ridge/Colockum Pass areas to Wenatchee, WA. Although this makes I-82 more of a N/S freeway from its start in Hermiston, OR, maybe renumber this Interstate "I-9." Would provide easy access to the current wind powered generators in the area. Would provide a better connection to US-97 as it continues north up the Columbia River and the Okanogan Valley and British Columbia.
I-490: Redesignate US-395 between Ritzville, WA (I-90) and the Tri-Cities (current I-82) as I-490. This road is nearing completion as a freeway and, to me, this is a "no-brainer."
Complete the North/South Freeway (US-395) in Spokane.
I-290: Airway Heights to Idaho border. Provides an E/W loop freeway around the northern areas of Spokane, WA. Portions of corridor already signed as WA-290.
WA 410: Naches Pass Tunnel road. Super 2 this road from Sumner, WA to its junction to US-12 west of Naches, WA. Would bypass current alignment through Mount Rainier Park. Would provide an easier winter access to Crystal Mountain Ski Area from the Yakima Valley. Would provide another safe Cascade Range crossing.
Puget Sound crossings: Extend WA-518 to WA-16 via Vashon Island. Don't like that? How about a tunnel/sunken "floating" tube from Spokane Street viaduct in Seattle to Bainbridge Island connecting with WA-305. Could be designated I-305.
Whidbey Island crossing, WA-525: Suspension bridge from Mukilteo, WA to the Columbia Beach area on Whidbey Island.
This one will rile the environmentalists. Inter-connect the four principal islands of the San Juan group with bridges.
I-7: The Oregon East Cascades Freeway. Portland, OR to Bend, OR and beyond (Weed, CA?). Would provide a faster and safer route for the yuppies and ski bums to "Oregon's Playground." Fantastic views of volcanoes. Follows US-26 and US-97 corridors.