[Simpson did it](https://www.simpsonraceproducts.com/products/head_and_neck_restraints/hybrid/hybrid_s/parts/HYSLRG11M61) and you don’t even need a roll cage just a helmet
> Seems like it would make crashes measurably safer, and the only downside is that it’s cumbersome to equip each time you’re in the car.
It probably makes it worse for a passenger vehicle.
Believe it or not race cars and passenger cars have different design.
HANS requires a roll cage, a proper seat, a many-point harness and a helmet. For one this makes it incredibly hard to do head checks and drive a car backwards and corner in carparks etc as opposed to straight in a race car.
HANS was primarily to prevent basilar skull fractures - where your head whipped forward while your body is rigidly tight in the harness. For one that's not a huge problem in passenger cars. Passenger car seat belts aren't quite as rigid, there's a little give before they tighten. And you have the air bags to cushion your head in a way the race car does not.
If you're not doing roll cage, seat, harness, helmet the HANS is fairly pointless.
I have a HANS. You need a harness and you can’t buckle it without a friend touching your dick on accident.
It’s not the thing you can just ask a stranger to do when you’re leaving the grocery store.
>You need a harness and you can’t buckle it without a friend touching your dick on accident.
He tells you that's "on accident", huh? Bwahahaha.
Just kidding, you are absolutely right that this is absolutely a track-only setup.
It would only help in a very limited subset of accidents that are not common in the real world, and the rest of the time you'd be severely compromising comfort and visibility by wearing a helmet and HANS.
No upside here.
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