Wearing a helmet is always better than not wearing one. You never know what kind of accident you might be in. Sure there are some a helmet may not protect you from, but there are plenty where a helmet will. It's a stupid, pointless risk not to take such an easy precaution to reduce your odds of permanent brain injury.

Case in point, a few years I was on the home stretch of a 50 mile weekend bikeride, less than a mile from home. I was tired, dehydrated, and fuzzy-brained, but still alert enough to be paying close attention to the traffic around me. I was riding ~10-15mph in the far left lane of one-way 4-lane primary thoroughfare (35mph speed limit).

4-way intersection ahead, figured I'd cross the intersection and ride up onto the very wide sidewalk on the far side so I could get out of traffic, slow to a crawl, relax, and take it easy the rest of the way home. As I came up to the intersection I angled slightly toward the sidewalk ramp on the other side, then turned my head around to the right to watch the traffic coming up behind me to make sure no car was going to make a left turn at the intersection and either turn into me or cut me off.

All clear with cars, no left turners, but when I looked ahead again I saw I'd miss-judged my path and was going to miss the on-ramp by about 5ft and hit the nearly 1ft-high curb instead. Going too fast to correct course and hit the ramp, or to slam on the breaks and stop, only thing I could do was try jump the bike, or at least the front wheel, over the curb.

Too tired, botched the maneuver, not quite high enough, front wheel hit the curb about halfway up and went from around 10-12mph to 0 in a millisecond. Of course me and the rest of the bike kept going, me slingshotting over the handlebars (bike shoes clipped in so angular momentum at work here) and then piledriven head first into the concrete sidewalk. My head landed first with a loud crack, then my body landed on my head, then the bike on top of my body.

I might have been out for a few seconds, not sure, but the first thing I remember was thinking, "ok don't move a muscle, just lay perfectly till, you might have just broken your back and even the slightest movement could cause a tear in your spinal cord." Slowly, gradually, tentatively I started testing that individual fingers and toes worked, then hands and feet, then arms and legs, and finally body and neck.

Everything was ok, but I was still lying there not daring to try to get up. Next thought was, "ok, that loud crack was my head hitting the concrete, I probably have a concussion. gotta be careful, don't black out." Reached up to my head, started feeling around. Helmet broken in places, totalled as designed, but still attached, strapped on, conformed to my head.

Still lying on the sidewalk with bike on top of me, afraid of further injury, and feeling around my head checking for injury. No blood, no pain anywhere. Disbelief. Check again, thoroughly. Still no blood, no pain. More disbelief.

Can I really have just had a crash that bad, where my head alone absorbed the entire impact of my 200lb self and ~20lb bike, without any injury besides skinned hands and some bruises? Mindbogglingly, yes that was exactly what happened. That helmet absorbed the whole damn thing, and I walked away without either a concussion or any kind of neck or spinal injury, just some scrapes and bruises.

So yeah, just wear a helmet. Even if you have 10 accidents where a helmet is irrelevant and just 1 where it is, it will have been worth it.

If my anecdotal evidence doesn't impress you, then think of it terms of Expected Payoff E(X). Wearing a helmet costs nothing of consequence, yet the benefits could range from 0 (you're never in a crash your entire life and never need it, or you're in a crash where a helmet makes absolutely no difference) to everything (you're in a crash that would cause permanent brain damage or death without a helmet protection). You can see how the averages work out.

Humans are very poor by default at evaluating risks that have low odds of occurring, but very high consequences if they do occur. Bike crashes are exactly this kind of risk, so don't be a typical human here - don't blow these types of risks off, discount them, or ignore them. Be smart, mitigate or neutralize them.

This summer I was hit by a truck pulling a wide trailer. The truck overpassed me, but the driver neglected the fact that his trailer was about a foot wider than his truck. It smashed me from behind and laid me out on the pavement. I was lucky enough to not fall under the trailer, but still smashed hard onto the road and nearby sidewalk. My helmet, without a doubt, saved me from a serious head injury. I walked away with some extensive road rash and a minor concussion.

> pedestrians alike just aren't looking

You mentioned you obey the law so you probably don't do this. Even if the law does not prohibit riding on the sidewalk, you should never ride on the sidewalk.

Just wanted to take this time to remind everyone that bicycles do not belong on the sidewalk.

I'm not talking about riding on the sidewalk. I'm talking about pedestrians who walk out into the street (when they don't have the light) in front of a cyclist because they're only looking for cars and not bikes. I'm talking about pedestrians who walk into bike lanes without even looking at all.

I'm a cyclist and I'm constantly looking out for them and I still sometimes accidentally walk into them.

One of the biggest problems with New York's new bike lanes is that a great many pedestrians treat them as sidewalks and cops don't give them tickets for it. It totally should be a jaywalking ticket.

I disagree. Bicycles belong on sidewalks far more than they belong on roads.

That said, perhaps it's situational. My city has large amounts of arterial roads with heavy car traffic and sparse pedestrians. The speed limit on those roads is about 60 kph (about 40 mph), and I much prefer to stay off them as a cyclist. It would be much safer if I was allowed to cycle on the sidewalk in those areas, as there's little to no foot traffic. In the city itself, different matter. There's much more foot traffic, but the speed limit is lower, so perhaps it's best there to be on the road.

One of the first things my driving instructor taught me is that you have to assert your right. A measly bicycle has as much right to be on the road as a Cadillac Escalade. At the risk of preaching to the choir, a bicycle should take up a full lane on the road unless there is a special bicycle lane.

I am not saying go crazy and ride your bicycles on freeways. This is more about city streets. That being said, I truly believe the way to have fewer cars striking cyclists is to have more cyclists assert themselves on the road.

Cycling on highways I'm pretty sure is illegal everywhere, thankfully.

I'm also an advocate of taking up a full lane, but the laws in many places (like New York) actually require you to ride to the right/shoulder where feasible. Unfortunately that's not really clearly defined, so even though you have a legal right to a full lane, cops will still give you a ticket.

Having narrowly avoided being doored a few times, I won't ride anywhere within a foot's range of a completely open car door.

But if you do then do it at the speed of the pedestrians.

There's nothing wrong with riding on the sidewalk as long as you're careful and it's not crowded. You shouldn't go blasting down it, but if it's safe and legal, what's the problem?

Sometimes it's the only sane option. While I can legally ride my bicycle on a four-lane road with a speed limit of 45MPH and no real shoulder, I'd have to be crazy to prefer that to the sidewalk that sees perhaps one pedestrian an hour.

I had an accident recently as a cyclist with a vehicle, and I thank my helmet a lot for my lack of injury.

The vehicle was a van, and turned right across me going straight (which normally I'd see clearly and avoid, but the way they hesitated implied they'd seen me so I rolled through. Alas.) I'd wager I was going around 20mph/30kph as I hit the side panel. Hips/shoulders first, then I felt my head whiplash into it. Without a helmet, I'd expect at least a mild concussion. With a helmet, I was able to roll away relatively unscathed (minor cuts/bruises) after we exchanged details.

Helmets can help at all/many speeds. They're not a perfect solution, but they're great sometimes. Don't discount them so bluntly :)

Current helmets protect against impact injuries (eg, the pavement hitting your head). Yes, when the speed/energy is high, helmets won't do much. But when the speed is moderate, helmets help a lot. Then, there's also wearing the helmet properly, something many bicyclists fail to do.

The helmets today are only tested with straight on impacts: they're tested by dropping them straight down on the crown of the helmet. But that doesn't happen in the real world. You're moving, meaning you're hit at an angle, meaning that there's a potential for a diffuse axonal injury[1]: the rotational component of the injury. MIPS[2] has helmets that help protect against that.

Is wearing a helmet safer than not wearing a helmet? Without a doubt.

[1]:https://en.wikipedia.org/wiki/Diffuse_axonal_injury

[2]:http://mipshelmet.com/home

Helmets protect you. I slid down a street and my head bounced on the pavement - without a helmet I would have been much worse off. The road rash was enough. Another incident was a truck mirror that grazed my helmet. Nothing major, but in all, the helmet does its job.

> Another incident was a truck mirror that grazed my helmet.

Of course, if you weren't wearing the helmet, the truck mirror may or may not have touched you at all.

This. I saw a bus mirror actually catch a guy's helmet and pick him up off his bike by his head, hauling him down the street.

Had he not been wearing a helmet, that never would have happened.

I hope you aren't saying that seriously. If those vehicles caught bicyclists in the helmet, they were both just too close to the cyclists. What if the cyclist swerved an inch to avoid a rock in the road, or even simply turned his/her head to look at something? Yeah, whamo.

Thus everyone should avoid helmets! They can kill. Seriously: Outliers do not describe a population.

So you are fine with approx an inch clearance with passing vehicles? I don't think so.

this guy got injured right where thickest part of the standard styrofoam helmet is. About half way above the eyebrow to the temple. He survived (but there was a lot of blood) but with the helmet he'd walked from the scene with a few scratches on his knees.

I'm not saying "all". But I drive about 400 miles per week (long commute) and I can say that I've seen approximately 5 bicyclist last month which stopped at the stop sign. They really stand out of the crowd.

I saw a bicyclist flip over a car door. He just had a baseball cap on, but it was torn to shreds. I'm glad that wasn't his forehead on the asphalt.