Ahh-hah! I am glad you explained the problem. What ever or who ever put the brake on at 70 was very lucky you are here to tell the story.
You have either melted the rear barkes or a brake component broke and jammed a wheel. The emergency brakes operate only on the rear wheel.
Jack up the rear wheels one at a time. Put the car in neutral and see which wheel won't turn by hand. I expect only one wheel is jammed. After that, depending on your level of experience, remove the tire and then work on getting the hub/caliper off and see what happened.
Let me know
Wednesday, May 3rd, 2006 AT 7:22 AM