Is it though?
Looks like some morons have been doing donuts in the middle of the road, it makes sense to try and set up as a deterrent.
I think its obvious he is there to catch people who come down the slight downhill straight a too fast and judging by the abuse he got from bikers they clearly thought the same. Clearly parking their to simply issue tickets, to generate money, surely he would be more advised to go and park in a built up 30 area where safety is required.