This grows tiresome, Helmets do NOTHING at protecting your life because they were not designed to protect your life,.And a helmet so designed would be something like 6' in diameter. That would make the helmet a greater threat to the rider than the danger from cars.

As for saving lives here is a study showing that helmets do NOTHNG to protect you from cars https://www.vehicularcyclist.com/kunich.html

I have gone back and checked to see if anything has changed and it has not.

But this is NOT the problem. If a car hits you at just 35 mph you are DEAD. Cars commonly exceed 35 mph even in school zones. So pretending that your body can withstand that sort of shock is simply ridiculous.

But I nevertheless recommend helmets because helmets were not designed to save you if you were hit by a car. They were designed to save you for the other 95% of accidents - the fall overs. The ones like I had - a funny noise coming from the front wheel and I bent over while riding to see what it was - it was the carbon fiber fork failing and as I bent over with my head only 24 inches above the ground, the fork exploded and dumped me directly on my forehead. I was wearing a helmet and if I were not my skull would have fractured. that would not likely have killed me but the ER doctors would have taken my injury as a serious injury rather than simply being knocked out for 5 minutes.

Instead because helmets are designed to prevent skull fractures rather than moderate concussions, I had no external signs of serious injury.

The injury from the concussion was so bad that I was having a type of seizure which diabetics often have - I could not remember having the seizure and so was unaware of them., My brothers were totally ignorant of what a seizure is and one thought that I was simply getting very mad and the other thought I was going crazy. Finally a cop friend got me to Stanford Medical Center because I could not even remember to eat and had lost 42% of my body weight, My cop friend thought it must be cancer but the doctors ruled that out and recommended one of the professors of neurology who had a small local practice as well as teaching.

He had never seen a concussion that bad and the only way to treat it was with drugs. So I will spend the rest of my life taking maximum doses of two medications twice a day for about $8,000 a year to control it and these are the CHEAP medications. After 10 years, I am more or less normal except for the side effects of those drugs.

Now, in the meantime, Trek under the auspices of the Bontrager brand name has invented the 3D printed Wavecell helmet which is designed specifically to decelerate the head below the concussion rate. I have fallen off once with it and indeed it appeared to work. The shock didn't even make me dizzy.

Also other idiots have claimed that the injuries from the neck being twisted and replied with the MIPS helmets which have a mounting that will twist in a collision. I am extremely doubtful of this and indeed the Wavecell doesn't need these sorts of mountings since of the controlled deceleration.

The take home from the study and analysis of the study, and the personal experience is that you should wear a helmet of your own volition and it appears without further proof that the Bontrager Wavecell helmet is more intelligently designed than the old foam helmets. Helmets should not be mandatory since the manner in which many people ride simply doesn't require a helmet. Head injuries are rare and mandatory helmet laws are made in the belief that helmets can protect you in an automobile collision.

Also I would like you to know that neurologists are not the same. Most of them treat various dementias and soon forget anything they ever knew about concussions. I had gone to several neurologists on the recommendation of my private doctor and most of them were useless. Dementias, in general, can only be slowed and not stopped and these neurologists get pretty fixated on the idea that they can in the end do nothing. So there are good and bad neurologists to treat a concussion vs.dementia and you have to be aware of that and find the proper one. I was lucky to be near Stanford Medical Center where some of the very best doctors are.