This. Last time I did this the driver said he was a cop and had a pistol in a holster on his belt. And he was mad because I took the lane and kept him from breaking 2 laws.

Riding with a bright helmet light helps here too, it makes it really obvious that you're there to the drivers who get to close or start to pull out when they shouldn't. Cameras also get some drivers to pay attention too, nothing like knowing their actions are being recorded to make some people start to behave better.