A Speeding Question

That was a speeding question? It didn't seem that fast to me.

 

Well, I did keep driving. It was a stretch of four-lane road. Typical business zoning through part of town where it's all 45 and I was following the limit. There's a traffic light, and after that the businesses quickly thin out. A quarter-mile up the road it goes to 55. I was in that quarter-mile just before it hits 55, passed the light and had sped up to 55 since I knew it switches pretty quickly.
The cop was coming down the other side of the road, must have clocked me on the run, and turned around in a crossover less than 100 yards from the 55 mph sign. I passed him, glanced to the right and saw the sign, and then looked in the rearview to see him cutting his lights on. He caught up to me about a mile up the road.
The sticking point in this is that I WAS going 57 and my state has an absolute limit when it comes to the letter of the law. Even if I fight it and win on the merits of the signage issue, they might make me pay up anyway since I still was over the 55 mph limit.