<human>: Can you provide a brief overview of the text?

So an old merc was so close behind me today even though I was going 51/52 ish in a 50 zone controlled by average speed cameras- usually I'm quite clued up on where cameras are and I know when I can go over the speed limit and that.. Anyway so he's well close for ages even though I'm in the left lane, he can overtake at any time! Or just go same speed in different lane just not up my arse..
Happens sometimes I spose! Nothing I could do after that really as we separated when it went back up to 70 mph.

I recognised his number plate because it ended in NWA (I know- I would be ecstatic) 

We met later in heavy traffic, here's where I plotted my revenge- I pulled up on his left (I'm in England so we drive on the left side of the road- I'm on his passenger side) and I saw that my lane was going to move before his- just before I moved off, I gestured to him to wind down his window (manually as it was an old car) acting like I was saying something about his car.. Once he got the window down, i drove off with the traffic.

I know first hand how annoying it is to stretch across to do that and I would have been livid if it was the other way round. 

Hope he learned his lesson.
<bot>: guy was driving up my arse, when I met him later in traffic I got him to wind down his window (manually) and when he did I drove off