限速标识意味着什么？What does 'speed limit' mean?
在道路条件良好情况下的最低时速The recommended speed for that road
在道路条件良好情况下的最高时速The fastest speed for that road in good conditions
推荐时速The minimum speed for that road in good conditions
最高时速限制，不过超车的时候可以高过这个限制The fastest speed except for when you are overtaking another vehicle