These supposed 'green' crusaders are clogging up streets in every city across the UK, causing more problems than they solve by slowing up automotive traffic. They aren't the solution, they are part of the problem.
Why does this idea matter?
Cyclists should be made accountable. As a regular city commuter (enforced to use a car due to the nature of my work), I have had to pay out a fortune for scratch repairs to my car due to the negligence and bloody-mindedness of cyclists. I also spend more time queueing in traffic during the summer months because of cyclists meandering 2 or 3-abreast down congested city streets.
They are not saving the planet, they are making a nuisance of themselves, causing more congestion than they claim to solve, and ride away scot-free from incidences of willfull damage to other peoples' property. It's time it stopped.
Bikes must be registered to owners and carry a registration plate. And they should also be insured, to help pay for damage to other vehicles.
Finally, they MUST be made to comply with the rules of the road.