As with many arguments there are two sides to this one. You don't need to pass an intelligence test to drive a car or ride a bicycle. But driving a car poses a threat to life and limb that dwarfs that of a bicycle. Were I a judge I would use simple math to dole out punishments to offenders. A bike weighs 20 pounds, a car 2,000 pounds. So the punishment for a car related offense would be 100 times that of a bicycle. Of course it's true that bike riders are responsible to operate in a manner to promote safety but that does not cover all scenarios. In my city there was this guy years ago who was mentally and physical challenged who rode a bike right down main street every day. One day a huge dump truck got behind him at a stop light so close that the driver could not actually see him. As the light changed the truck driver forgot about him and drove right over him killing him and crushing his skull so both his eyes were bulging out like some kind of space alien. The city council then swung into action and banned large trucks from using main street. The truck driver was not prosecuted. It didn't help much as the carnage has continued. Some judges may be using the mathematical formula already but in reverse. Remember when a slave was valued as 3/5 of a human? Well a cyclist may be valued as 1/100 of a human. I never ride my bike on main street.