This is a recently widened strech of hiway, now 8 lanes with a high concrete median in the middle.There is a break in this median wall just big enough to get a motorcycle through underneath a bridge which crosses over the interstate. It’s approximately 1/4 to 1/2 mile from the Hwy 21 exit. I had gotten on I-77 heading Northbound about three exits before this point. The speed limit is 60 mph here and all the way to Charlotte, even though it’s 8 lanes all the way. Most people go about 70 mph. But there are cameras all along the highway. ("only for monitoring traffic conjestion") I was traveling with the flow of traffic when a silver BMW four door sedan passed me on the right side and was probably going 7-10 mph faster. Since I was running late, I decided to fall in behind him at a respectable distance and get to my destination a little sooner. I was depending on my Escort to give me enough warning of radar, since I was BEHIND the BMW. What came next made me wonder if the BMW was an unmarked troopers car.(BMW has an assembly plant in Greenville and has donated several sedans and motorcycles for the highway patrol to use). The BMW continued to be my "front door" until I passed under the bridge, at which time the Escort went wild. I knew that police radar was close by but I didn’t see a vehicle. I was in the outside lane at the time and was preparing to get off at the Hwy 21 Southbound exit which was four lanes over.I got off went under the overpass and down about half a block to a red light. I stopped at the light then turned right, which is legal after a full stop, provided no one’s coming the other way. I had gone about 1/4 mile when I heard a siren and looked back to see a motorcycle coming up behind. I was at the business where I had an appointment but decided to pull off on the shoulder, since the "motorcop" indicated he wanted to talk to me. He asked for my license, registration and proof of insurance. I asked him why he stopped me and he said he clocked me at 86 mph! This was such a shock that I forgot to get him to specify exactly WHERE he was when he clocked me. I told him respectfully that I had not been traveling anywhere near that speed and that he must have gotten a reading from someone else’s vehicle and thought it was me. I asked him if he had clocked the BMW ahead of me. He said he had and it was going 78 mph. That’s interesting since I was following him and not gaining on him. He said he’d reduce the speed on the ticket to 69 in a 60 mlph zone which is 2 points and I think $50 "IF I DON’T GO TO COURT"! Since it would be my word against his in a small town where I had NO influential contacts, I just paid the fine, reluctantly. I’d have loved to have gotten the revenue cop on the stand under oath to explain why he didn’t ticket the BMW but did ticket me.