I don't think the average car driver could ride a bicycle as transportation- look who's out there, people! - gas prices alone won't do it.

The average driver is so obese and out of shape that riding a bike is a fate worse than a jerry springer marathon. There's a lot of people who can't ride for health or practical reasons as well. What about families that live in suburbia? forget it, for most, bikes are only recreational. And the average driver is usually tied to their automobile like a liferaft in the north atlantic after the freighter flips.