Additionally, the risk bicyclists take in having their bikes stolen is already a high "tax" to pay. And the risk is very high. Who would enforce it? Which bikes get taxed? Mountain bikes, not used on roads? Kid's bikes? The BMX bikes? The bikes that hang in my garage and never get ridden? The money raised would hardly offset the cost of enforcement and oversight. The overwhelming majority of bike owners also drive cars and pay taxes for those. Finally, why would we ever want to add yet another reason for people to drive over riding bikes? 

This noise needs to stop.