Last night, on the way back from squash in the cage at about 10:30.......on a single carriageway NSL road I came to a roundabout with a 30 limit and I went straight across, but I noticed a car came right up behind me, swinging from side to side......We exited the roundabout and the road went back to NSL, so I accelerated to that (ish) but matey was still on my tail.....He couldn't overtake because of oncoming traffic......A bit further up the road the oncoming traffic disappeared, so matey overtook very close and then sang in front of me, so I flashed him......so he brake tested me.....so I flashed him again.....and he brake tested me again. An old fella in an old Merc estate. Further up the road he overtook another car and a van into oncoming traffic......Both flashed him, but he carried on. I was half expecting to see him in a field, or worse, further up the road, as it gets a bit twisty. Driving like that it's only a matter of time before he kills himself or someone else. The unfortunate thing was that I didn't have my dash cam in the car.....