haha..I do overtake from left too, but not so obvious as zig zagging. Maybe over take left but keep left for a while until catch up with slow left driver then only switch right, but if whole highway full of cars then just follow the traffic loh.....Maybe but I don't really care coz I just don't want to wait until the cows come home for the road hoggers to finally give way. So if the middle or left is empty and I can see there's a slow poke on the right, then that's simply what I'll do. I may give them a few quick flashes of high beams but if I can see they won't budge then I will never waste any more time by staying behind them on the right lane or even tailgating. I hate tailgaters so I don't do that. Often I'd already switch lane at some distance from those road hoggers so that they'd notice me coming from their left if they check their mirrors, just to minimize the risk.