While there were some folks that were not starting in the correct corral, things were never too congested. I think that the fact that each corral had about 300-400 people in them really helped out. The first 1/3 of a mile or so was within the paved section of the Las Vegas Festival Grounds. After that, you made a left hand turn out onto Sammy Davis Jr Drive and down about a mile until you turned around to head back towards the finish.