A Yellow Light Means...

[Vipershark]

It depends. Yellow lights aren't some kind of cryptic puzzle or anything.
Once you drive for a while and are able to gauge distances at speed more correctly (and are actually -paying attention-), you also magically gain the ability to have a rough idea of how long yellow lights last from actually seeing them.

I used to stop on every yellow when I was new to driving but now that I can gauge distances I generally speed up a bit to get through them. Yeah, I stop at some, but nowhere near as often.
It's as simple as:

Of course that's a bit more simplified and depending on traffic layout and stuff each light can be different, but this is pretty much the basic thought process on any yellow light.