I learned it back in the late 60’s in Drivers’ Ed. It was also in a booklet for would-be motorists published by the state of Illinois, called “Rules of the Road.” Here’s some more information: Top 10 DMV Questions – Yellow Traffic Light Signals
A continuous yellow light doesn’t ever mean “Floor it!” It’s a warning that the light is about to turn red and it’s giving you a chance to stop if you can do so in time and safely. You don’t need to slam on your brakes but you do need to yield to other traffic and stop if possible. If you stop at a continuous yellow light and the driver behind you hits you, he or she is the one at fault because he or she was driving badly.
Finally, here’s a perspective some other folks might appreciate: What does a yellow light mean? - YouTube
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