I bet someone in the Secret Service got their ass chewed out for not the checking the ground clearence on the exit of that place. Having the POTUS out in the open and stuck in one place is not very good for the security detail.
I may be too much of a redneck, but if the President (even if it is Barry Sotoro) is stuck in a compromising position like that, I'm going to use the other car to push his limo off of the speed bump.
It ain't rocket science.