25 mph in residential or school districts,
55 mph on rural highways,
and 70 mph on rural Interstate highways.
Posted speed limits (sometimes called regulatory speed limits)
are those that are sign-posted along the road and are enforceable by law.
今天查了一下，25mph=40kph，在居民区与学校。
55mph=88kph，在郊区国道，
70mph=112kph，在高架高速。
联邦就这三个限速，但是允许地方设置低于联邦的限速。


【 在 rayray 的大作中提到: 】
: 每天瞎扯淡不觉得丢人吗  
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FROM 116.2.197.5