It's a bit of an overstatement to say "most" cyclists blow through stop signs and stop lights, especially the latter. It would be no more an overstatement say that most car drivers don't come to a complete stop and "blow through" stop signs or stop lights while turning right on red. Cars also drift in and out of their lanes, often into bike lanes. When cyclists "drift" out of bike lanes, it's usually because there is some debris in the lane that they are trying to avoid so that they don't crash and end up lying down in the traffic lane and getting run over.Exactly. I mean how many bikers follow traffic rules? Most of them blow through red lights and stop signs with no hesitation. They shout bloody murder when a motor vehicle gets a bit close to them, but they routinely drift out of bike lane. Everyone who uses the road is part of the traffic, and thus should follow the same set of rules with no exceptions.
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I did a traffic survey a few years ago over the course of several weeks on my usual bike commute route to work in the MD/DC area. I counted 500 traffic violations by car drivers for every traffic violation by a cyclist. This included speeding, failing to stop at a stop sign or traffic light, stopping in the crosswalk, not signing turns or lane changes, driving in the bike lane, driving while holding a phone or texting, passing closer than 3 feet, etc. I'm guessing you wouldn't claim that car drivers always obey traffic rules because then we would never have car crashes.
In an increasing number of states, bicycles are legally allowed to roll slowly through a stop sign and continue on if there is no cross traffic. They can even treat a red light as a stop sign and proceed through (after stopping) if the intersection is clear. This has been the law in Idaho for almost 40 years and the number of car-bicycle crashes dropped significantly (like 30%). The reason is that the intersection is the most dangerous place for a bicycle. So, if the bike can get through the intersection when there are no cars there, it is much safer than waiting for a bunch of cars to pile up behind a bike and then everyone fights to get through the intersection when the light turns green.
Most states now have LAWS that require motorists to give at LEAST 3 feet (4 feet in PA) of room when passing a bike. The draft from a car (or, especially a truck) passing at high speed tends to suck the cyclist into the passing vehicle, so it is critical to maintain a safe passing distance. Many studies have shown (and I experience it all the time) that drivers are notoriously bad at judging how far they are from objects (like bikes and other cars) to their right (or left in countries that drive on the left) and so, yeah, it's scary when you pass me within inches. Another reason why the 3 feet rule is in effect is as I said before - the bike lane or shoulder or right lane if there is no shoulder often has debris or potholes that the cyclist must steer around and if you pass too close, you could force the cyclist into the ditch or underneath your wheels.