There are a lot of perceptions about child car seats that parents across the nation, including many here in New York, have. One is that the more expensive a car seat, the safer it is. Another is that if a car seat is on the market, then you can trust that it’s safe. And finally, if a manufacturer says that a car seat is safe then you assume that it’s been thoroughly tested. But the National Highway Traffic Safety Administration pointed out this month that these perceptions aren’t necessarily true, especially when it comes to thorough safety testing, which has resulted in a proposition recently that could prevent many serious injuries from occurring in the future.