《联合国道路安全公约》强制要求安装并使用手刹。美国作为缔约国,绝不会允许没有 手刹的车辆销售。任何汽车制造商也不会傻到公然违反这个规定。原文: Every motor vehicle other than a motor cycle shall have brakes which can be easily operated by the driver when in his driving position. These brakes shall be capable of performing the following three braking functions: (a) A service brake capable of slowing down the vehicle and of stopping it safely, rapidly and effectively, whatever its conditions of loading and whatever the upward or downward gradient of the road on which it is moving; (b) A parking brake capable of holding the vehicle stationary, whatever its conditions of loading, on a noticeable upward or downward gradient, the operative surfaces of the brake being held in the braking position by a device whose action is purely mechanical; (c) A secondary (emergency) brake capable of slowing down and stopping the vehicle, whatever its conditions of loading, within a reasonable distance, even in the event of failure of the service brake. http://www.unece.org/fileadmin/DAM/trans/conventn/crt1968e.pdf