Did you see that movie about the inventor of intermittent windshield wipers?  Fascinating movie about what men do. They dig in. Sometimes, like in the movie, they loose their marriage, their life, their kids, their bank account, but in the end they get a movie deal.. No, I loved that movie, especially the line about:

“An intermittent wiper is just a collection of parts from Radio Shack”

To which the inventor in court replies,

“Are you saying Shakespere is not copyrightable, just a collection of words?”

Beautiful comeback. I wonder if that happened in court.

In the same avenue as a simple windshield wiper circuit, comes a simple cruise control circuit which knows the speed limit. This is a shameless plug. Wikispeedia has been perfecting this since 2005. You can read about it here.

You see, old men like me love cruise control. Its like having our own self-built autonomous car, delivering us along the road. We go 5 over and enrage everyone behind us. If you like that kind of techomobile stuff, I am sure you are aware of the DIY comma.ai site where you can build your own tesla/google/waymo car….

I got off topic. Make sure you read about the invention of the cruise control in the reference below. It reminds me of the sewing machine wars, ideas that are so hot, that even the simpliest improvement causes a patent war. Money Money Money….

Ref:  https://www.pistonheads.com/features/ph-features/ph-origins-cruise-control/37511