Comment by cge

> It is not legal to enter the intersection if you cannot clear it before the signal turns red.

That does not appear to be the case in California, which this article is written about. It seems to be a bit confusing, because there are suggestions that the driver handbook suggests that you should follow the rule you note, but that the law itself has no such requirement.

In practice, in many areas of coastal California almost no one would stop at a yellow unless they felt they could not enter the intersection before it turned red, and doing otherwise would likely be seen as impeding traffic by many other drivers.