1.   The heavy rain made it necessary to close several roads.

2.   The mountain road was closed by snow.

3.   The road is closed following a serious accident.

4.   The road will be closed for security reasons.

5.   This road is closed to motor vehicles.

6.   The road is closed ahead, so traffic will have to follow the detour.

7.   The road was closed to vehicular traffic.

8.   We may have to close some roads to traffic and make them pedestrian only.