First thing I thought of was: 60 MPH is a sedate speed? That's 88 feet per second, so if the car stops abruptly at that speed - no matter how it's done - the occupants are going to be tossed around inside. Add to that the high probability that the passengers of a limo aren't wearing seat belts, and you have a prescription for serious trouble.
If Superman can't be seen to stop the car, most of the above solutions would work, but the speed is pretty high. If a limo skids out of control, it takes a lot of energy and skill to get control of it again.
But now I'm wondering where that scene is going to show up. Soon, I hope!
