time limit for opening to traffic

例句：

1. 1.The city has a strict time limit for opening its parks to the public.
   该市对向公众开放公园有严格的时间限制。
2. 2.The company has set a time limit for when employees must finish their work before leaving.
   该公司设定了员工必须在离开前完成工作的时间限制。
3. 3. The traffic police enforced a time limit on the number of cars allowed to enter the city center during rush hour.
   交通警察对市中心允许的车辆数量在高峰时段实施了时间限制。