Ooooh, I never thought of that. But, just to play "devil's advocate", doesn't statutory construction say that statutes must be read as a whole, and when items are separated by the conjunction "or", you may choose ANY one of the alternatives? So, wouldn't that simply say that, if you have a green light, you may:
Go straight.without further qualifying those movements. Other statutes dictate HOW a driver must turn right, left, or make a U-turn. But I cannot find one that defines "go straight". The statute on driving within a lane simply says you cannot change lanes until "such movement can be made with safety".
Make a U-Turn
Anyway, it's an interesting question. And, remember, Aaron is an attorney and I am not, so there's a REALLY good chance that HIS interpretation is right, while I'm just running off at the mouth (or keyboard).