,participants are fully responsible for the risk. this WAIVER text is from Seattle Marathon registration, https://www.athleteslounge.com/events/register.php?popup=1&subid=1931&eventid=1845.

WAIVER: I know that running a road race is a potentially hazardous activity. I should not enter and run unless I am medically able and properly trained. I agree to abide by any decision of a race official relative to my ability to safely complete the run. I assume all risks associated with running this event, including, but not limited to tripping and falling, contact with other participants, the effects of weather, traffic and the conditions of the road, all such risks being known and appreciated by me. Having read this waiver and knowing these facts and in consideration of acceptance of my entry, I, for myself and anyone entitled to act on my behalf, waive and release the University of Washington, University of Washington Medical Center,......