Is a chin strap with a cup safer than an under-chin strap? Many helmets have chin straps to hold them on.
One design uses a split chin-strap, where the strap splits into two forming a cup shape, one going just below the lower lip and one under the chin.

In my opinion, this is a more comfortable design as the chin strap is against the chin bone instead of pressing against the fleshy underside of the lower jaw.

I found a single link http://www.usyouthsports.org/images/CPSC_Hangman_s_4_point_chin_strap.pdf which claims that this design is safer for bike helmets as it may reduce some cases of strangulation in case a &quot;yanking&quot; force is applied to the helmet.

Were there any other studies done on chin strap design like this for bike helmets?
Is this design safer?
Are there any bike helmets actually available with this chin strap ?
Helmet strap will strangle kids, there are cases of children in play grounds not being able to get out.
I would add the magnetic buckle as the solution to these problems. e.g.
https://www.fidlock.com/en/helmet-buckles