Building protected bike lanes is probably a smart thing to do.<p>However, it doesn't solve the problem of arrogant bike riders who believe that the rules of the road don't apply to them. There's an idiot in my neighborhood who insists on blowing thru the local stop sign at about 20 MPH. Much worse, he's taught his young daughter to blow thru the stop sign right behind him.<p>So what's the percentage of bike riders who get into accidents mainly because of their own stupidity? Is it 1%, is it 10%, is it 90%? I think it's a fairly big number, at least 20%.<p>I'm not trying to troll here. I'm trying to make the point that <i>quite a few</i> bike riders are dangerous. How do we protect bike riders but also protect the rest of us against that stupid minority?