During the Summer, I rarely wear a helmet.
I am 56 years old, have no dependents, and have a living will with a close friend.
I don't wear my helmet because I don't like them. My choice.
If I had a dependent child, I would INSIST that they wear a helmet.
95% of my riding (about 150 miles/week) are on dedicated bike paths and trails physically separated from automotive traffic (not
bike lanes). I am lucky to live in a place that has hundreds of miles of dedicated bike paths.
I usually wear a bandanna as a headband, and frequently listen to Rock&Roll via earclip headphones.
If I take a spill and crack my head.....such is life. I don't wear a helmet in the bathtub either.
I frequently observe riders with helmets riding in traffic with absolutely no concern for the cars overtaking them. They seem oblivious, like having the "right of way" and a "helmet" is a magic cloak that protects them from drunk or stupid drivers. The 5% of the time that I use
the streets, I turn off the music. I am hyper vigilant. I check traffic by sound and by turning my head every several seconds. I "see" every car that overtakes me. I tried a mirror, but found it to be unreliable.
If the traffic is light, I will frequently ride
against the traffic on back streets or the burbs (hate the burbs). I like to be able to see the car that is going to hit me. When a car is coming, I will either switch sides, or take to the sidewalk. Riding against the traffic is also a good way to protect against car doors that suddenly open in front of me. (The people in a parked car can see you coming if you are riding on the "wrong" side".) In the 50's and 60's, riding "against the traffic" was the preferred method.
In Winter (Minneapolis) I ALWAYS wear a helmet. It helps keep my ears warm (holds my hat over my ears), and would give some head protection if the bike suddenly
"spits out from under" on glaze ice (something I don't fear in the Summer). I change to studded tires when the daytime temps drop under 30 degrees.
I frequently run red lights and stop signs when no cars are coming. I know it gives all the rest of you a
bad name, but I hate stopping when I'm
"in the zone".....and, well, I'm a self centered asshole and an old rebel.
Some things I NEVER do because its just TOO dangerous:*I NEVER ride without eye protection.
*I NEVER ride without gloves that have a leather palm. If I do have to "get off", my palms are going to hit first.
*I NEVER EVER ride after dark. Even with a ton of reflective tape and bike lights, it is much harder to see and avoid the "new" pothole, new crack or the brick or rock or branch that someone has thrown on the path, or the drain grate.
*I NEVER ride with "clip in" shoes or pedals. Great for racing, but much too dangerous.
*I NEVER ride on busy main streets or any highway ... WAY too dangerous.