Federal FOPA laws are observed. If the person is traveling without a permit that's valid in Washington the gun must be unloaded or be in plain view.
A nick name for the FOPA law. It is a federal law upheld by most (but not all) states. Peaceable journey allows a gun owner to travel through states where they do not have a license to carry, without fear of being arrested. Most states require the firearm be unloaded, in a locked box, or out of the driver's reach when they are in the vehicle. In some states the drivers must pass through the state without stopping, and in others only short stops are tolerated.