The race route itself is exclusively on back streets moving through the Vernonia area so unless you need to travel through that part of the area you'll probably not encounter any runners. The real potential jam ups will be from three different sources, first you'll have all the team's support vehicles out there, by that time of race they'll be pretty punchy. Second horde of unpredictable traffic will be all the folks trying to get to Seaside for the race's ending celebration. I suspect the majority of people out at that time on Saturday morning will fall into this category. The third group will be all the folks going to the coast on summer's Saturday morning anyways, a considerable number of people usually. I suspect you can also count on more law enforcement out at that time because of all this extra activity. I'd recommend tacking on another half hour at least to your planned commute time.