Mr. Hamilton is quite correct in his assessment of I-5.  If you drive it "wet", you will notice the two tracks of water standing in the right lane from wear from heavy truck traffic.  The left lane is clearly in much better shape than the right.  I will often drive in the left while watching my mirrors for approaching traffic traveling faster than I am.  I'll pull over, let them by and, often, then drive back in the left.  The real issus is not "driving in the left lane".....it's holding up traffic by doing so.  Gary Crum