单选题 · 选择一个答案
You are travelling in a 70 km/h area and approaching a 50 km/h sign. With no emergency or contrary direction, which plan is correct?
你正行驶在每小时70公里限速区，前方出现50公里限速牌。在没有紧急情况或另行指挥时，哪种做法正确？
Prepare early and reach the lower limit by the sign; the new limit is not a grace period for slowing down afterwards.
应提前准备，到达标志处时就符合较低限速，不能把驶过标志后的路段当作减速宽限区。
阅读相关知识
Observe the road and traffic behind, ease speed down safely and choose an even lower speed if conditions require it. The number on a compulsory sign is a maximum, not a target.
观察道路和后方交通，安全平稳地减速。路况需要时应更慢；强制限速牌上的数字是最高速度，不是必须达到的目标。