this savings amounts to 30 cents per year per person
True, it doesn't seem expensive, but this was just to correct wrong ideas voiced here. Since thirty cents hardly covers the cost of a seat belt, there must be more to it, and of course there is. A quick search to find other estimates readily finds that for Minnesota and Missouri, savings would be around $1.70 per year per resident. I would also expect a buck or two for other states as well so it still looks affordable. But these savings are strictly for medical costs. They do not include the cost of families caring for their cripples and their lack of employability during this time, nor does it include the cost of additional deaths with productivity reductions, nor the impact on families and friends.
Also note that the reported costs are not for seat belts versus no seat belts, it is just to make the remaining minority start using them like everyone else, and only a minimum estimate of a single factor. If we calculated all savings per driver with and without seat belts, we would have a better idea of their financial value.
Here is a relevant article:
http://www.concordmonitor.com/apps/pbcs.dll/article?AID=/20070416/REPOSITORY/704160352
"Nationwide, the failure to buckle up cost an estimated $26 billion in 2002, according to the National Highway Traffic Safety Agency." That's $86 for each citizen, whether they drive or not. It becomes even more significant considering that this cost is caused by a much smaller number of people who drive and who do not buckle up. Those are the target of a mandatory seat belt law.
EDIT:
To price this even better, if 80% of Americans are licensed to drive and all of them actually do (which they don't) and if a conservative 3/4 of drivers already buckle up, then no more than 1 out of 5 American actually drives without a seat belt to account for the $26 billion in question. For them, the individual share of this annual bill is $430 which really should be paid in additional insurance if not in fine. I don't know how many people value this particular freedom enough to justify its cost.