They are allowed on Interstates, frex on I90 from just outside of Issaquah to Spokane. It's not all that pleasant or fun, but they are allowed.
Shoulders suck as a place to ride though, it's where all the road debris hangs out, waiting to puncture a tire.
http://www.legislature.mi.gov/(S(disednjhhuuyovzmbvhdxfys))/...
Are you sure that Washington doesn't just have a provision in state law requiring action to close a shoulder?
https://app.leg.wa.gov/rcw/default.aspx?cite=46.61.160
They are allowed on Interstates, frex on I90 from just outside of Issaquah to Spokane. It's not all that pleasant or fun, but they are allowed.
Shoulders suck as a place to ride though, it's where all the road debris hangs out, waiting to puncture a tire.