There is a short section between Castella and Dunsmuir at the intersection of the Pacific Crest Trail, where we must ride on the Interstate for a few short minutes. The section is between Soda Creek Road and Crag View -- both exits are rarely used and have very little traffic. The total distance you are actually on the freeway is approximately 2/10 of a mile. The terrain is a very gentle upslope and we estimate most of you would be off the freeway in less than 5 minutes. We have 3 huge warning signs on the Freeway, and the entire length of the section is coned off creating a safe bike path to the far right of a rather wide shoulder. Please stay on the right side of these cones and ride in single file at this segment.