speed limit
noun [ C ] uk/ˈspiːd ˌlɪm.ɪt/ us/ˈspiːd ˌlɪm.ɪt/
（道路的）最高时速限制，车速限制
the fastest rate at which you are allowed to drive in a particular area
a 50 mph speed limit 50英里／小时的车速限制
Slow down - you're breaking the speed limit. 开慢点——你超速了。
Try not to go over the speed limit, Daniel. 尽量不要超速，丹尼尔。