See, here's the issue - as I've touched on before, one of the primary reasons for all of the above behaviors is bad infrastructure. Cyclists don't generally ride on the sidewalk because they want to - it's often crowded, you have to ride slower, and the facts show it's actually much less safe than riding in the street, even with no bike facilities. But for most sidewalk riders, it's about perception. Given the choice of having cars zoom by mere inches away in some cases, or ride on the sidewalk, the safer option in many cyclists' heads is to head to the sidewalk.
I observed this time and time again with a bike lane near my house. The lanes, which had continued for over a mile, abruptly ended several blocks from the next major intersection with nothing more than a tiny sign (seen above) and most people (especially those with children in tow) would transition over to the sidewalk. Given high vehicle speeds (due to speeding, not an inherently fast speed limit), I can certainly sympathize with the choice. But what this really illustrates is that if you want to avoid bad behavior, avoid bad infrastructure. I never observed someone riding on the sidewalk in the stretch with bike lanes (aside from children, who are allowed to do so). It was only the bad infrastructure design that dropped the bike lanes that caused them to make that choice.
What constitutes bad infrastructure? Well, any number of things, but especially notable are transitions from good to bad. As mentioned above, bike lanes abruptly ending is one example. I've mentioned before the example near AT&T Park where a cyclist was killed after the bike lane she was riding in abruptly ends and she was hit and killed by a cement truck.
Other examples include band-aid infrastructure improvements - most often in the case of sharrows. Because these markings mostly do nothing (especially because they haven't been accompanied by education as to what they actually represent for drivers and cyclists), they often aren't heeded by cyclists, who instead continue to ride in the door-zone and car drivers still don't give bikes safe space due to impatience. Separated trails often just end - as I recently encountered approaching the Berkeley Marina along a new Bay Trail extension. I'm heading along a beautiful trail, when all the sudden, BAM, I'm dropped into a gravel parking lot with no signs as to where I should go. Granted this is new, so maybe markings are still coming, but when was the last time you ever drove down a road that didn't say very clearly that it was a dead end or not a through street?
Next time someone complains that cyclists don't deserve better infrastructure until they all follow the rules, keep in mind that much bike infrastructure is designed in a way that basically encourages cyclists NOT to follow the rules out of concern for their own safety or schedule. For a great example of how good infrastructure works, SFMTA recently installed protected bike lanes along the Great Highway near the Cliff House. I used to ride up the sidewalk in this stretch. It's wide, generally not too crowded, and as a natural continuation of the trail along the beach, it was convenient too. However, now that they installed the lanes pictured below, I made sure to use them, since I want to leave pedestrians with the sidewalk. Now that I have a safe way to head up this route (since you're especially vulnerable when going uphill and slowed down), I'll choose that every time! Improvements like this are a great example of getting it right with infrastructure!
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