There are thousands of miles of freeways,expressways and turnpikes,yet rapid journeys are not possible unless the driver is prepared to risk a heavy fine,for there is a speed limit of 55 mph.

• 美国有成千上万英里的免费高速公路、快速干道和收费高速公路。因为车速限制在每小时55英里，所以快速行车是不可能的，除非驾车者准备冒支付一大笔罚金的风险。