It is a frequent issue with car drivers on Motorways and dual carriageways.
> Set your cruise control to speed xx.
> Watch as you rapidly start to overhaul the car ahead,
> Indicate right to overtake the car ahead.
> Watch as that car, you thought you were going to overtake, now attempts to match your speed.
> Marvel as the same car now rapidly pulls away into the distance.
> Oh Oh, You are now rapidly overhauling it again, and you have not altered your speed.
> Try accelerating and making the pass.
> Now watch as the same car accelerates, pulls out and overtakes you before pulling in front of you and slowing to a speed slower than when you started this dance.
I have no idea why people do this? They must be aware that they are speeding up (instead of remaining at a constant speed) and stopping you from passing, but they do it. I have seen cars go from 65 to 95 then back to 65 again, why? If they are unaware? They should not be on the road, it is 'driving without due care'.
I have also had the drivers that overtake me when I am sat on cruise, to slow in front of me, so I have to cancel cruise. At this point they will then speed up again. It's like they have an organ pedal and not an accelerator pedal.