Curiously, how DOES a seatbelt hinder arm movements?? If it is
so, how come seatbelts are mandatory devices drivers need
use?
Perhaps, you should try on a sweater/shirt/jacket backwards, then
line up some road pilons and try to negate them by weaving your car
in and out between them at 30Kmh.
If nothing happens, do it faster, as most accidents occur at higher
speeds where reaction is critical - such as 60Kmh and above.
Then see how the backward worn shirt/sweater/jacket behaves with
all that arm movements.
