This was my second year running the Dopey Challenge (all 4 races for 48.6 mile total). I'm reviewing this year to discuss JUST the marathon day rather than the entire weekend. All the weekend races started at 5:30am with the exception of the marathon, which was shifted up 30 minutes to 5:00am. For those staying on property, especially those staying at hotels with monorail access, the morning was relatively uneventful, however for many locals and runners staying off-site, an obscene traffic backlog occurred that delayed so many runners that the race was delayed an extra 15 minutes to allow more time for runners to make it to the corrals in time for the start. While a majority of runners, including myself, were at the start on time, a very large portion of attendees were forced to sprint to the start and jump in the last corral, starting their race off on a sour note. Overall, the first half of the race ran smoothly while the sun was down. We had received NUMEROUS warnings about heat advisories from the official social media posts as well as the race hosts and officials. That being said, when the sun rose, the game changed. I was in corral D and by the time I hit the half way mark, people were already passing out due to heat exhaustion. This year, the course was set to run through all 4 theme parks as well as Blizzard Beach, however due to the heat, the course was shorted and Blizzard Beach was cut out in order to bring the runners out of the heat sooner. These climate circumstances were totally out of Disney's control, but the volunteers and medial teams were OUTSTANDING. I've never run a race with so much support, both physically and emotionally. Not a single volunteer was negative about the weather and they stayed out until the sweepers crossed -- never losing their energy or spirit! Medical teams were prompt and caring to all athletes from mile 1 to 26! Despite the slightly shortened course (Blizzard Beach was about 2 miles) the race (and the weekend as a whole) had all the magic and excitement one can expect from Disney! Thank you volunteers and hosts for keeping our safety in mind -- it is for this reason and many others that I will continue to run races with RunDisney!