We just drove S/B through the Sac area and it didn't seem bad, but we were in the DW's Explorer. In regards to I-5 N/B through and pass Seattle, OMG what a mess. They can and do regulate the speed limit for individual lanes using overhead mounted electronic signs. Speeds as low as 30 MPH N/O Seattle, although the HOV lane was 40 MPH. And don't start me on the drivers for that would get me kicked off the forums forever.