Reminds of the time I was doing 117 in a 55 back in the 70's in HI.
The cop only knew I wasn't doing 55, but never knew exactly how fast I was going due to other traffic (and no radar).
My buddy pulled up and told me there was a copy way behind us.
We knew we couldn't lose him in the traffic, which was getting thicker, so we pulled off onto the shoulder and waited for him...and waited...and waited.
Finally, the copy pulls up behind us and gives the us blah, blah, blah spiel while writing us citations.
While he was doing that, I glanced over his should and saw his car puking coolant out like a waterfall, which made me smile.
Anyway, we both went to traffic court and explained to the judge how we pulled over to wait for the cop.
But the cop was unable to prove exactly what speed we actually were doing (rightly or wrongly).
So the judge threw the case out. Victory!