MANILA—Motorists will experience smoother traffic conditions on the South Luzon Expressway (SLEX) once the Skyway extension project is done, San Miguel Corp. president and chief operating officer Ramon Ang said on Tuesday.

Once completed, the P10-billion Skyway project, which is expected to be completed December 2020, will ease traffic flow there for the next 10 to 15 years, according to Ang.

"'Pag natayo po 'yan (extension project), wala na pong traffic diyan," Ang told radio DZMM.

The extension project has caused heavy vehicular traffic on the expressway after it occupied one of the three lanes for construction.

• Coming soon: Traffic chaos on SLEX-SB due to Skyway extension

Ang said motorists can again use the occupied lane on Nov. 30 to decongest the traffic congestion in SLEX.

"Back to normal na (on Nov. 30)," Ang said.

Skyway O&M Corp. (SOMCO), the SMC unit in charge of the project, said the extension project will raise the Skyway’s capacity by 4,500 vehicles per hour northbound, and 3,000 vehicles per hour southbound, giving motorists from Southern Luzon easier access to Metro Manila.

• WATCH: What will finished Skyway extension look like?

Once the Skyway Extension is finished, vehicles coming from south of Metro Manila will be able to take the Skyway and bypass the Alabang viaduct, even EDSA, said SOMCO.

The construction has aggravated traffic conditions along the SLEX, with travel time from areas south of Metro Manila now taking 3 to 5 hours.

Lawmakers have proposed to reduce or suspend toll rates due to road conditions.

• SLEX toll suspension, rollback proposal under study: official