就是说本条款也适用于大巴中巴？那可真没办法了。以前也没注意过那些小孩子在shuttle上是怎么坐的。我刚刚网上订机场shuttle，填了小孩年龄，也没有car seat这个选项。不知道这种情况没坐car seat，到时候怎么算？
同一网页还有下面这条，是不是说4、5岁的孩子只要系上安全带（不用car seat或booster）坐出租车就不会有问题了。
2. For children aged 4 through 5 years, a separate carrier, an integrated child seat, or a child booster seat may be used. However, the requirement to use a child restraint device under this subparagraph does not apply when a safety belt is used as required in s. 316.614(4)(a) and the child:
a. Is being transported gratuitously by an operator who is not a member of the child’s immediate family;
