I don't see anything wrong with using those techniques. They're just not enough on their own to make the system sufficiently general to be useful. Extra ste

I don't see anything wrong with using those techniques. They're just not enough on their own to make the system sufficiently general to be useful. Extra steps are needed, and even then, there would still be cases where the lane markings can't be reliably made out. In those cases, human drivers would fall back on more general driving skills.