[dllthomas]

You're less visible on the sidewalk than in a lane, and you pose a threat to others. I'd almost go so far as to say, "Cycle where you're supposed to, or don't cycle." Moving in unexpected ways in unexpected places is what leads to collisions.

[Silhouette]

While your factual statements are true, and cyclists on sidewalks can certainly be a menace, I don't think it's really tenable to argue that cyclists should always be textbook road users unless you also ensure that everyone driving larger and motorised vehicles also plays by the rules.

I live in a city known for having many cyclists, and there are always tensions between the local cycling population and the authorities about the poor level of law enforcement against dangerous drivers. Of course, there is also a poor level of law enforcement against cyclists doing dumb and illegal things. The difference is that when something goes wrong, it's usually the cyclist who ends up injured or dead, not the motorist.

So while in an ideal world we'd all get along nicely and play by the rules, I don't tend to get angry at cyclists whose choices are illegal but obviously safer (as in, I've read the actual research and current law and/or public policy clearly doesn't promote the safest option, not just doing something that intuitively feels safer but maybe isn't really).

[dllthomas]

"The difference is that when something goes wrong, it's usually the cyclist who ends up injured or dead, not the motorist."

In the case of riding on sidewalks where it is inappropriate, it's also frequently a pedestrian.

"I don't tend to get angry at cyclists whose choices are illegal but obviously safer (as in, I've read the actual research and current law and/or public policy clearly doesn't promote the safest option, not just doing something that intuitively feels safer but maybe isn't really)."

In those cases, I agree that the cyclist should do what's safest (presuming it's safe enough - on balance - for everyone involved). So should drivers of vehicles, for that matter. My understanding is that taking the lane, where traffic is moving at a speed the cyclist can keep up with, is the best way of keeping everyone safe (I wouldn't be recommending it otherwise). You are right where everyone who might hit you can best see you. I say this as someone who cycles in a big city fairly regularly, with a spouse who bikes in a big city even more regularly, in the wake of biking safety classes. I'm not just an annoyed driver/pedestrian/whatever trying to keep the cyclist down.

[lilsunnybee]

Most big cities to me seem a lot safer for bicyclists than a lot of smaller cities and communities. The traffic is often slower, and accustomed to watching out for bicycles and pedestrians. In less populated areas, particularly those that have clearly provided no thought for the safety of anyone not in an automobile, or the occasional rare pedestrian, drivers can be very careless and accidentally or even intentionally run down a bicyclist at lethal speed. Nighttime is especially dangerous, not least for greatly reduced visibility, but also many more drunk drivers on the road.

A bicyclists safety is much more threatened by a multi-thousand pound vehicle traveling at 40 or more mph with a distracted driver on a seemingly deserted stretch of road, then a pedestrians is by a 150-200 lb body traveling at around 10-15 mph. The reaction time is also much greater, allowing more opportunity to prevent a collision on the part of the oncoming vehicle.

[dllthomas]

If bicycles are rare, you are still much more likely to be seen and avoided if you are where cars expect a car to be, then if you are where cars expect nothing to be.

Of course, there are still situations where riding in the street - either in a bike lane or taking the lane - is dangerous or otherwise impractical; the question is whether riding on the sidewalk is an improvement, or whether you should be forgoing cycling (perhaps walking your bike).