Something you can’t help but pay attention to while riding is other drivers. For obvious reasons, a rider’s life is much more dependent upon being aware of what the cars (and other vehicles) around you are doing.
So after a few years in traffic you get to pick up signs of what people are planning to do, often even before they even realise it themselves. The guy glancing to his right – there’s a strong chance he’s going to be changing lanes. The car slow or moving about in their lane – probably on their phone, all these signs are there and sometimes you don’t even realise you’re seeing them. But you’re slowing or checking your escape options.
So when the the guy in the ute next to me is driving along with his hand on his indicator I was pretty certain he was just waiting for a chance to change into my lane. I had only a car length a bit in front of me, so when the ute moved forward a bit and indicated right (into my lane) I was not surprised or very happy. I held my ground as there was plenty of room behind and there was no reason for him to cut in so tightly.
And I’m well glad I did, the ute dropped back and changed behind me. Immediately he then changed further right, slowing for a turn lane.
So if I had let him in, he would have immediately slowed with me less than a car length behind him, and changed lanes again. A good chance that I might have crashed into him.