Everywhere I read about the teenage driving "epidemic" (if it were a disease killing thousands of teenagers every year, imagine the response of our government), the solutions are always about changing licensing, rules, training, parental responsibility, etc. Never do I read about changing society so that teens (and others) just don't need to drive—or as much.
I get that people think that low density suburbs are great places to raise children. This might be true. But they're generally horrible places for teenagers.