Disney will sweep your ass, but they are pretty fair about it. They start in the last corral (for reference, it here is an elite then something like a-h for the rest, and I, a 2:40 half marathoner, got in corral B) and are consistent with their pacing. There are still tons who get swept in these races, which blows my mind. CG though, that seriously bothers me. I've heard of that happening all the time.

I thought this was pretty crazy...

Rock 'n' Roll races offer to drive slower runners farther up the course,

Kinda just cheating yourself if you do that, aren't you?  I'm sorry, but if I ever had to do that - take a ride farther up the course - maybe I would continue on, but from then on, it would just be for fun and to cheer others on and when I got close to the finish line, I would divert off course and not cross the actual finish line to give myself an official time for the event, and just mark myself as DNF.  Cuz IMHO doing that kind of thing - finishing after getting a ride part-way - just disrespects all the people who actually completed the entire course. But maybe that's just me.

It is crazy, and the Rock n Roll Las Vegas marathon had a 4.5 hour course limit!!

For 2013 they increased it to 5 hours!

Time Limits- New to 2013 Event- The full marathon time limit has been increased to 5 hours!

From their website:

If a participant’s pace falls below the course time limit, they have a few options:

• Increase their pace to stay within the event minimum pace;
• Board a “sag wagon” shuttle to move forward on the course, where they may continue to participate in the event, maintaining the minimum pace required; or
• If the participant cannot continue, they may board a sag wagon to be dropped off at the next shuttle location, at a nearby medical station.