comes from your personal experience of observing the world around you.

Here is an example. It seems logical to me - yet... A former roommate of mine had NEVER figured this one out until I pointed it out to him.

There is one traffic light on Orangethorpe Ave in Anaheim that Glenn ALWAYS got stuck at. He ran a red once - and got a ticket - because he just couldn't time it right.

And he couldn't figure out how I always knew when to stop and when to proceed through the light.

We were together in his car one day and he started slowing down. I asked him why and he explained the situation described above.

I told him to watch the "Walk/Don't Walk" light and he'd never get another ticket.

Simple, huh. Common Sense??? You tell me.