RV Blows Tire Causing Roll-Over Video

Excessive speed for this driver was whatever speed he was going that he could not control his vehicle when HE had a flat tire. Many people have had flat tires on the highway and they do not end up flipped and on the other side of the highway.
Excessive speed is any speed that exceeds the driver's ability to control an emergency situation. Some people have great reflexes and some do not. Some people react and some people freeze/panic. It cannot be defined as a set speed that applies to everyone.