(27-08-2012 03:05pm)Bodlyfunctions Wrote: Nightfox, whilst I agree isofix is better, seat belts ARE designed for the purpose of restraining people and baby seats. And seat belts are fixed directly to the car so very little difference. There is absolutely no way that RoSPA would allow seat belts to be used for child seats if they were not up to the job, and seat belt fixing utilises less space behind the front seats - I only mention this as I would not wish to panic anyone who currently has their child seat secured via seat belt option.
Sorry, I wasn't meaning to imply that setbelt-restrained seats are in anyway unsafe, just that I'm convinced that Isofix is a safe
r option.
Isofix was a pretty new thing when I first bought a car seat, so I did quite a bit of research at the time. It would seem that Isofix came about to address a number of perceived failings in seatbelt-restrained child seats:
With a traditional seat, there's no clear indication of when the seat is correctly fitted, and in checks it always seemed that a massive proportion of them were fitted incorrectly. I think it's one of those things where you think only other people get it wrong, but on a few occasions I've come to the end of a journey to find the child seat loose after I was sure I'd fitted it properly. With Isofix, it's either fitted (with green tell-tales showing) or it isn't.
Although traditional child seats all pass stringent tests, the fact is that there are so many variables affecting how they fit and work in every different car - things like seatbelt anchoring point, strap angles, fastener position, seat rake, seat profile etc will all have an effect on how the seat weathers an impact. Again, Isofix removes most of these variables with two rigid connections.
Traditional child seats rely on compressing the car seat as much as you can and holding the child seat against the car seat with the seat belt to keep it in place. Ultimately, in a high-impact collision the force on the child seat can compress the car seat much more, potentially allowing the child seat to move as it 'bounces' back.
I know you always have to be sensible and not get carried away with child safety, but personally I'd always go for Isofix if it was an option, though quite happily used a seatbelt-restrained seat in my non-Isofix Discovery.