校车“物以类聚”的标准是什么？

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美国共有四类符合联邦机动车安全标准要求的大鼻子校车，另外还有一种并不符合联邦机动车安全标准中对校车​的要求，但也常用于学校运输的车辆。
A total of four class meet federal motor vehicle safety standards require the school bus, there is also a kind of does not conform to the requirements of federal motor vehicle safety standards for school buses in, but also often used in the school transport vehicles.
(1)A类。A类校车https://dwz.cn/bIiI3RCI驾驶室独立，左侧有一驾驶员门，额定载客量大于10人。该类校车又分为两类，即A-1类，车辆额定总质量小于等于4536kg(10000磅)的校车;A-2类，车辆额定总质量大于4536(10000磅)的校车。所有A类校车均需满足联邦机动车安全标准中对校车的要求。
(1) A class. Class A bus bridge is independent, the left one the driver's door, the rated capacity is more than 10 people. The school bus is divided into two categories, namely A - 1 class, vehicle total quality rating less than or equal to 4536 kg (10000 lb) of the bus; A - 2 class, the vehicles rated total mass is greater than 4536 (10000 pounds) of the school bus. All class A school bus to meet federal motor vehicle safety standard requirements for the school bus.
(2)B类。B类校车车身安装在一个有车头的底盘上，幼儿园校车额定总质量大于4536kg，额定载客量大于10人。该类校车的特点是发动机部分位于前风窗之下和，或之后、驾驶员座椅旁边，乘客门位于前轮后，并需满足所有联邦机动车安全标准中对校车的要求。
(2) class B. Class B school bus body is installed in a car's chassis, vehicle rated gross mass is more than 4536 kg, the rated capacity is more than 10 people. Characteristics of the school bus is engine parts is located in the front window and under the wind, or after, the driver seat beside, located on the front passenger door, and must meet all federal motor vehicle safety standards in the requirements for the school bus.
(3)c类。C类校车也被称为常规校车，其特点是车身安装在后部为平板、前部有发动机并装备有发动机罩的底盘上，车辆额定总质量大于4536kg-额定载客量大于10人，发动机全部位于前风窗前，乘客门位于前轮后。该类大鼻子校车均需满足所有联邦机动车安全标准中对校车的要求。
(3) c. Class C school bus also referred to as the regular bus, its characteristic is installed in the back of the car body is flat, the front of the engine and chassis is equipped with a hood, vehicle rated gross mass is more than 4536 kg - rated capacity is more than 10 people, all the engine is located in the wind before the window, after the passenger door is located in the front wheel. The school bus must meet all federal motor vehicle safety standards for school buses in the request.
(4)D类。D类校车也称为Transit-style，其发动机可以前置、中置或后置，车辆额定载质量大于4536kg，额定载客量大干10人，乘客门位于前轮之前。该类校车均需满足所有联邦机动车安全标准中对校车的要求。