I have driven truck on & off over the years & just noticed something now that I am back to driving a big truck part time. It used to be when you passed another truck, the driver behind you would flash their lights when there was enough room for you to get back in the granny lane. And then you in return would flash your trailer light to say thank you. This is nearly non existent now. Did somebody change the unwritten rule, or is this new generation of truck drivers just too lazy to do it?