Over
here in Germany...
any child under the age of 12 years old or
36 Kilograms must ride in the back seat. Here is a Google translated German site on the law and the different versions of child seats.
http://translate.google.com/translat...o.html&act=url
Also interesting is on ECE (German spec) BMW's you can turn off the air bag for the front passenger seat.
And yes... IF safety is your concern... a closed car offers better protection than an open(cabrio) car does. Even when its top is up. A closed car is just plain safer.
Dackel