Originally Posted by livedarklions

The common ground is they're both vehicles on the road that are expected to follow rules. If you want to make a more specific comparison, what's a rule that would have the same impact on both types of vehicles? I think that would be a very short list.

In my experience, drivers routinely run red lights (right after they turn red), take unsignaled right turns across lanes, pass in no passing zones, ignore pedestrians in crosswalks, back out of driveways into traffic without looking, fail to yield before taking a left turn in front of traffic, and pull into traffic lanes from parking spaces without signalling. All of these have vastly greater impact on other people's safety than just about anything a bike can do.

Also, so what if speeding is really just a factor for cars? It's a rule violation with very real safety implications.