In 1968 I had reserved a Mustang from Hertz at San Francisco airport. When I arrived, the clerk told me they were out of Mustangs - - would I be willing to take a Shelby GT500 at the same rate? The only time I ever lucked out on a car rental. At checkin time, another clerk tried to argue about the rental rate but I had it in writing. Of course I don't recall having broken any speed limits.
What Hertz probably didn't realize at the time was that weekend racers were actually renting the cars, swapping the engine into stock Mustangs and running a couple of races, then dropping the engine back into the rental (at least, that's what I have heard). Anyway, Hertz only kept the Shelby program for about a year. I imagine they could have gotten some interesting GPS data if it had existed back then.
Of course not. You were going too fast to read the speed limit signs!