This question raises more questions here. Please, keep politics totally separated of safety and answer here political reasons not to cycle in some countries. The user Ambo100's earlier example about ...
I generally try to ride in traffic as a vehicle, following the rules of the road, stopping at red lights, taking the lane, etc. In many urban areas, you are not allowed to ride on the sidewalk ...
When using a bike on a road in the USA, is it ever legal not to have separate brakes on the front and back wheels?
When using a bike on a road in the UK, is it ever legal not to have separate brakes on the front and back wheels?