Turn Signals

When did turn signals on automobiles become an option? Do you have to pay more to get them?

Did I miss that part of driver's ed that mentions that you only need to use them when no one else is alone?

And why, if the speed limit is 70mph and drivers are driving 70mph - why do they put on the brakes when they see a cop on the side of the road.

Hello, people - you aren't braking the law, why are you slowing down?

Oh, yeah, I remember. It's not against the law to be stupid.