Yes, but that additional cost does discourage people to use a bike. And many countries want to encourage rather than discourage bike use, for several reasons:
* bikes don't endanger other road users the way cars do
* bikes pollute less
* bikes take up less space
* bikes put less strain on the road
* bikers get more exercise and are therefore healthier
All of these are important positive effects, so a lot of countries would prefer to stimulate bike use rather than discourage it. They don't have the same reason to encourage car or motorbike use, so having the extra cost there is fine. The alternative for a car is likely to be better for society, so it's fine to discourage their use. The alternative for a bike is likely to be worse.
Yes, but that additional cost does discourage people to use a bike. And many countries want to encourage rather than discourage bike use, for several reasons:
* bikes don't endanger other road users the way cars do
* bikes pollute less
* bikes take up less space
* bikes put less strain on the road
* bikers get more exercise and are therefore healthier
All of these are important positive effects, so a lot of countries would prefer to stimulate bike use rather than discourage it. They don't have the same reason to encourage car or motorbike use, so having the extra cost there is fine. The alternative for a car is likely to be better for society, so it's fine to discourage their use. The alternative for a bike is likely to be worse.