I like the "concept" of the intersection...but at the same time, I can see a logisitical/strategic nightmare.
Imagine if the "make a rope" task this week would have been an intersection instead (and one of the first four teams was no longer in the race)....You have three teams leave the pitstop within 30 minutes of each other, and race to the clue. The third team shows up a few minutes behind the second team...Now they have to wait almost 4 hours for Mark and Bopper to show up.
That's what I'm afraid of happening, a team getting a serious time penalty simply because another team screwed up on a previous leg, or missed a flight, or something like that.
Now, the challenge I'd love to see show up is the "Fork in the Road." It's a combination detour and roadblock. Reading the clue gives you two cryptic clues (for example "Who's got a taste for the finer things in life?" and "Who's up for some fun?") The team has to each select one of the two clues, and they each head off to do their own road block. When completed, they are given a clue that leads them to a meeting point. When both players arrive at that point, they are given the clue to the next location.