According to most every report regarding this issue, the prevailing wisdom is that the motorcade drives at a speed that prevents another vehicle from driving along side the Gov's car. So if some citizen is driving 70 mph, the motorcade could drive, say, 75-80 mph to get by the citizen's car. In theory, this is done to prevent the Gov from being a "sitting target" (my interpretation), so to speak.
But in actuality, the area where Corzine was isn't a densely populated section of the state .... in fact, it is not heavily populated or traffic laden at all. So that excuse about getting away from the traffic congestion doesn't hold water in this instance.
But it is also true that the speeds driven on most NJ major thorfares is extremely high. I can't say that the driving is the worst in the nation, but it's gotta be close to the top of the list. Driving at 80 mph in a 65 zone is routine, so in that light hitting 91mph is not unusual. Frankly, it isn't so much the speed that has NJ residents upset, it's the complete BS explanations from the Troopers and Gov's office that has everyone PO'd. If I, as an average NJ resident, was involved in a 91mph accident, they'd have me handcuffed to the hospital bed. The hypocracy is staggering ....