Happened to me a little over 14 days ago, waiting until now to post for reasons that will become obvious, on the M6 northbound in one of the many
roadworks sections enforced by SPECS cameras.
I'm in the outside lane, since I have a GPS and thus can accurately stick to 50, middle lane is more like 48 and the left lane at 46. A familar situation to many, I am sure. Slightly ahead of me in the middle lane is a Volvo 940 estate that had not yet triggered my idiot alert. Half a car length behind me is an Audi A4 that has triggered my idiot alert for several very obvious reasons (tailgating, front fog lights in the daytime, mobile phone)
Up ahead is one of those big metal barriers that close off the right hand lane, and stick-on green lane markers have appeared that shuffle everyone to the left a bit, ie. L1 moves into the hard shoulder, L2 into L1 etc. etc.
As I reach the barrier, the Volvo's front bumper is now level with the rear passenger door and my idiot alarm is going off. I quickly figure out what is going to happen and hit the loud pedal. Gearbox kicks down, turbo spools up and I unleash 6 cylinders of planet destroying fury to propel me to a child-killing 65mph and negotiate the lane shuffling that marks the start of the roadworks.
I start easing off the speed look in my rear view mirror and what do I see? Yup, it's the Volvo, now in my lane and very close to my rear bumper. The driver looks up, sees me, and gives me the middle finger.
Then I have to slow down to 45 for a bit to bring my average speed down to 50, "for safety purposes".
Why am I blaming the SPECS zone for this:
1) If the Volvo driver hadn't had to concentrate on his speedo so much, he would have seen the lane changes marked.
2) If I hadn't had to concentrate on my speed so much, I would have overtaken him faster and not risked being along side someone when the lane changes happen.
On a more positive note, if that had been on gatso lines rather than a SPECS zone, then things would have been a lot worse, as I'd have a choice of a fixed penalty, a side impact from the Volvo or a rear end impact from the tailgating Audi.