If you absolutely have to go through Seattle north-south, I5 at Denny might be your worst choke point. Drivers call this stretch the wreckage because you have to squeeze down to a narrow S curve to avoid a large pile of wreckage on the blacktop. There are always some scavengers hunkered down in the wreckage looking for easy prey--not a problem if you're prepared for it, but be warned, they'll leap right on top of a moving rig without a second's hesitation. No, the real danger is the Jarls. They like to set up snipers and ambuscades on the overpass or in the building overlooking the I. Picking a large group to convoy with is recommended, but don't expect them to stop and wait for you if you get a flat.