guy when you are driving. There has to be. After all, if you are driving 45 on a two lane road and another vehicle is in their lane coming towards you also at 45...you have to trust he/she is going to stay in their own lane.

Otherwise we all pull over and wait for the other guy to pass.

THAT ain't gonna happen.

Unfortunately, that trust is violated in some small percentage of time, but with billions of such passess every day, even a small percentage leads to 42K dead every year.