Haha, in autumn 2007, I was just approaching the junction for Denbigh, and overtaking on a downhill stretch, when my laser jam ... err... 'garage door opener' deafened me!
There was a police man waving an instrument out of his car window, parked up just by the junction.
That wonderful device protected me on more than one occasion - a rather essential accessory on a car with top speed in excess of 170mph!