Drivers often perceive of a person on a bicycle as moving much slower than they actually are. For example, they actually sometimes think they have plenty of time to pass them and then make a right turn into a driveway, not realizing how fast the cyclist is traveling.
It's not going to change very much any time soon, but we can help keep ourselves safer by knowing how drivers see and think, thus anticipating their clueless and sometimes life-endangering moves.

Always assume a driver doesn't see you. Always expect them to do the wrong thing. These two assumptions have saved my life more than once.