This is Texas but it is still a good account of where you should ride your bike in traffic.
Note that those of us living on the border between Washington and Idaho deal with both “practible” and “possible.” Idaho uses the “as far right as practicable” law and this discussion works just fine in Idaho. It works just as well in Washington where the law says “possible.”
The reason is that neither state requires you to ride in the debris at the edge of the road.
And as Bike Noob points out, this leaves just where to ride up to the discretion of the cyclist. That discretion needs to be tempered by the conditions on the road.
I like to ride the right wheel track to avoid door zones but where there are few parked cars, I don’t mind riding further to the right to allow a car to pass.
But you should never find yourself dodging in and out along a line of parked cars. With lots of parked cars maintain your line, scan signal and take the lane if you must to get by a parked vehicle or other obstruction.
In the last post, I mentioned the often-used rule of bicycling on the road: Ride as far to the right as practicable. But what exactly does that unfamiliar word — “practicable” — mean?