From Wazeopedia

Closures are an important part of real time routing. By adding road closures, wazers can automatically be routed around the road. Saving time, and frustration. In large cities, such as Toronto, closures can cause drastic delays. Waze can be especially helpful with closures with larger cities.

Closures can be added on many types of segments. Including: Freeway, Major Highway, Minor Highway, Primary Street, and Parking Lot Road.

Real Time Closures

More Details: Real_time_closures