While there is a very obvious visual disconnect between bicycles and automobiles, they both accomplish the same thing. In the eyes of the law, however, they couldn't be more different.
The day you turn 21 is one of the most important days in any American's life. It's the day you're legally allowed to buy alcohol by doing nothing more than flashing your government ID at the bartender.
The United States has a legal drinking age for a reason. Younger brains and bodies are not equipped to handle the effects of alcohol, but that doesn't stop minors from finding a way to get their hands on liquor.
Growing up, I was a good kid. Al through High School, I never went to parties, never did drugs, and never drank alcohol. There were exceptions, of course, but always under the watchful eye of mom and dad.