It’s happening again.

Saturday night, for the second time this year, Highway 401 will close down overnight.

The highway will be closed in both directions between Highway 8 and Hespeler Road as construction work continues on the Speedsville Road bridge.

Specifically, crews will be installing girders on the new Speedsville overpass.

With the highway closed, the flyover from Highway 8 to the 401’s eastbound lanes will also be closed.

The same stretch of the 401 was closed overnight once in May.

When it shuts down at 10 p.m. Saturday – likely reopening around 7 a.m. Sunday – drivers will again be encouraged to detour along Hespeler Road, Maple Grove Road and King Street.

Work to rebuild the Speedsville bridge is expected to continue into October, with Speedsville Road and two flyover lanes remaining closed for the duration of the project.

Next year, similar work will take place on the Fountain Street bridge.