MANILA - Northbound drivers should expect a slowdown approaching the Alabang leg of the South Luzon Expressway (SLEx) this weekend due to the restoration of a power transmission tower that collapsed in April due to a fire.

The northbound SLEx Alabang exit will be closed to traffic from May 20, 6 a.m. to May 21, 10 p.m. due to the repairs.

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— SLEX - MaTES (@OfficialSLEX) May 20, 2017

Traffic over the Alabang viaduct will also be momentarily stopped at anytime between 5 a.m. to 12 p.m. on May 21. But the National Grid Corporation of the Philippines (NGCP) assured the public that this will "not be the entire period."

Temporarily located at the rightmost lane of the Alabang exit, the tower, one of many which support the Biñan-Muntinlupa 230-kilovolt transmission line, will be returned to its original location.

• WATCH: NGCP tower collapses as fire engulfs houses in Alabang

In a status update on its Facebook page, the NGCP said construction of the tower's base was ongoing as of Friday night, and the lifting and attachment of the metal tower was expected to be on May 21, 10 days ahead of schedule.

"By May 20, NGCP will be redirecting the power of lines 1 & 2 of the Biñan-Muntinlupa 230kV line to ensure the uninterrupted supply of power to the area," the NGCP said.

The transmission tower collapsed on April 19 due to damage from a fire that hit nearby houses.