TC - ive flown enough people so far in my career to know how they respond to their first flight in helicopters. Naturally, on AOC work, it is mandatory to give breifings on doors, seatbelts, locations of first aid kit, fire extinguisher, evacuation procedures, but no matter how long you spend with them, how convincing they seem when they 'understand' and can actually open the doors, remove seatbelts etc, many have forgotten when it comes to the end of the flight, when their adrenaline (sp?), is rushing, so please dont try and convince me otherwise - its easy for all of us regalur users to assume, but now and again, just take a step back and look from a wider perspective.
A common device full stop in all transport modes would obviously be a good solution, but this is the real world after all, and we know that aircraft design is about comprimise.
As for Rally Cars, fast sports cars, bungee jumping, I dont see everyone participating in these all day every day in numbers on a par with the normal everyday car.
If a device is easy to use and understand, its more likely to be used and used correctly with or without supervision. A four point harness still has to be adjusted to fit properly.
I agree with four point harnesses been safer when worn correctly, but what about the wider picture for the helicopter and 'Jo Public' .