"Sunday" drivers

I shall save myself driving on a weekend from now on as I realise that there are more and more "Sunday" drivers on the road. I was having a leisurely drive in the east yesterday and I didn't really enjoy it. The driving skills of these drivers, evident from the red off-peak plates on their cars, are just disturbing. Especially on the expressway when they either hog the extreme right lane at 80 km/h or they simply cut into your lane at the last minute without signalling.