UPDATE ON BLUE LIGHT DRIVER IN THE BLACK CHARGER:
Stuart Watson and WCNC’s I-team confirmed the vehicle in this video (*warning: contains rough language): UPDATE 5/31/12: the YouTube video has been marked "private", but you can see portions of it on the WCNC report linked below
is assigned to one of their agents. Spokesman and Special Agent in Charge Russ Nelson of the Charlotte office is quoted by WCNC: “The employee was working on duty in an official capacity in a US Secret Service vehicle at the time of the incident.” They have referred the incident to Office of Professional Responsibility—their version of Internal Affairs.
WCNC’s report describes the action this way:
Charger appears to travel over 80 miles an hour in a stretch of Interstate 77 near Tryon, Tyvola and Arrowood, where the speed limit is 55 mph. Once the Charger catches up with the SUV, the driver pulls in front of the SUV and then taps his brakes. The SUV passes the Charger in the left passing lane. Then the Charger pulls over the SUV using flashing blue lights in the front grill, and when the sport utility vehicle stops off at the I-485 off ramp before the flyover, the Charger speeds away up the I-485 flyover.
See their full report here.