I tested the 160mph 'certified calibrated' speedo in my old '93 Mustang SSP x-HWY pursuit car. I did 140 when a new stretch of east-bound I30 between Garland & Rockwall TX was just opened up (this was around '99). I got popped on my return trip. He didn't clock me @ speed but knew I was flying as he noticed me when I had already let off & was coasting to slow down. Let me off w/a warning which I greatly appreciated.