Coming from an American individual’s perspective…
The point of these bills is not to increase the amount of bicycle riders, its to decrease the amount of dangerous carbon dioxide spewing gas burning cars on the road. So it seems like instead of encouraging bike riding (which doesn’t seem too clear in its application, would there be tax subsidies for the price of bikes, tax breaks for licensed bike owners, or what?), car driving should be discouraged.
In order to get people to switch from cars to bikes, it seems like there could be some better policy choices made than a tax benefit scheme for bike commuters. For instance:
1. Use public money to build more bicycle lanes/paths on or near roads, and also to build more bicycle racks/other places to “park” your bike.
2. If you want to use a tax, give businesses a tax break for encouraging employees to bike to work (although this would be hard to prove as well, it would be much easier to give businesses a tax break for paying for bicycle racks and the like)
3. Give people money for trading in their car for a bike (this could be government or privately run, although the government probably would rather just pay someone else to do it).
Of course, this would only work well in a city…a lot of the united states will never be able to give up cars, theres so much space and everything is so spread out, it couldnt work otherwise. This is true in some way for everywhere, there is no getting around the need to use vehicles larger than a bicycle which require more than human motive power to operate. So really, encouraging bicycle riding would have to be part of a larger scheme of incentivizing alternative fuels, electric cars (along with encouraging lower carbon emitting ways of generating power), mass transit, and general efficiency in the use of fuel/power.