Originally Posted By: paul

you would need a much larger one for a car because we are
only talking about a 100kg mass impact and
thats only 220 lbs.


What difference does size make? You haven't specified a size for your device, and you say it'll work, therefore you think it'll work for any size.

Or do you mean materials might not be strong enough to support higher forces? Well a tree can survive a car hitting it, so we could even make them out of wood.