The marathon and half marathon share one start at Congress and Fannin in downtown Houston and one course until mile 7.6, where the half splits off. Six corrals leave in pulses to ease crowding, and the finish is at the George R. Brown Convention Center. Refuelling stations begin at mile 2 with medical aid at each, and portable toilets follow every 1.5 miles. Roads reopen on a rolling schedule, so marathoners must hold 13:45 per mile after mile 7.6 or take a SAG van back. The course is USATF certified.
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