That's a terrible idea, for both principled and pragmatic reasons. Bicycles are the most energy efficient vehicles ever invented, getting approximately 1,400 m

That's a terrible idea, for both principled and pragmatic reasons. Bicycles are the most energy efficient vehicles ever invented, getting approximately 1,400 mpg equivalent in fuel economy. They produce no emissions (other than wear on tires and brake pads) at the tailpipe. They cause minimal wear and tear on roads. They take up much less space than cars, both when traveling and when parked. Regular cycling is associated with several extra years in life expectancy, reducing lifetime medical costs for cyclists. Also, the cost or providing cycling infrastructure is only a tiny fraction of the cost of providing automobile infrastructure. You can construct a permanent, continuous cycling network in a city for about what the city's road system costs in maintenance for one year. In short, bicycles produce almost no negative externalities and significant positive externalities, so it makes no sense to punish people for cycling with financial or regulatory barriers. Further, as the rate of cycling goes up, the rate of cycling casualties goes down, and the overall casualty risk for cyclists is lower than for motorists; so it is in everyone's pragmatic interest to encourage as much cycling as possible.