Originally Posted by Helmet Head
...The point is to figure out what they're doing, and to let them know what you're doing, and make sure you have successfully communicated that.
In a world where lane positioning and other such tactics actually accomplished something, there wouldn't be a necessity to figure out what an approaching driver was doing. Heck, in a world where drivers follow the laws of the road, and maybe showed some courtesy, figuring out their intentions wouldn't be necessary. You'd just automatically know.
Having to figure out an approaching driver's next move automatically assumes that whatever you're doing
is not working.