I caught a few minutes of that show last night. I was watching them slide those Crown Vics around a course, and I thought: "That looks like Belle Isle".
Sure enough - It is filmed on Belle Isle, here in Detroit. I had never even heard of the show!
Did you notice, though...When they had the final event (when they made the driver change)...They were blasting the cars with a fire hose, and the contestants had to switch positions. They made it look like they jumped back in the car and took off. However...they had the safety harnesses back on! I think they stopped/started filming during some of the events, but made it look like one continuous event. I'm sure that is typical of 'reality' shows, though.
I don't know if it is the only reality show worth watching - I enjoy Pass Time!
-Tom