This message is just a reminder that when traveling public lands, it is vital that all trail leader and attendees, educate themselves on the area that they will be traveling to.
There are many resources available on the internet and at the regional land use management offices throughout the PNW.
Specifically, Washington State's "Green Dot Road System".
You can learn more at this URL about the restrictions and accessibility of the Green Dot System.
Please take the time and read the fine print. It's up to all of us "user" of public lands to know the rules and limitations.