Yeah, I just looked and was reminded that they close one lane on the southbound side of Olsen Blvd from 5:00am to 12:30pm. That should be okay given the entrance to the Olsen lot on the northbound side. The light at Wellborn and George Bush always seems to be a problem on the half-marathon course, too.
I'm just thinking about the people from out of town or not knowing the race is going on. Those situations can get really tricky in my experience, but hopefully UPD, PTTS, and others will be out in full yellow gloved whistling force.