According to that, I can drink and drive. And speed... Certainly you're not going to punish someone who hasn't harmed anyone (or themselves).
I explained this as well, same as above. People have proven that persons speeding or driving while intoxicated caused them harm. I explained this issue to you six months ago... Operating a heavy vehicle posses a risk to other people as well as roads take into account the road design (curves, steep hills) and environment (pedestrians, school zones). Speeding exceeds other drivers expectations and driving while intoxicated places at minimum unnecessary risk on other people and is a threat to them.
Actually, that's pretty much the way Congress phrased it in the Controlled Substances Act.