A four-year freeway project in south Orange County will enter a new phase Monday, Oct. 23, when four northbound lanes of the I-5 shift onto a widened bridge over Avenida Pico.

The shift is scheduled for 5 a.m., the Orange County Transportation Authority announced on Friday, Oct. 20.

Motorists who travel the I-5 overnight this weekend through San Clemente can expect some lane reductions.

On Friday evening, Oct. 20, expect northbound and southbound lane restrictions at Avenida Pico from 11 p.m. to 5 a.m. as crews relocate temporary concrete barriers.

On Saturday, Oct. 21, from 11 p.m. to 7 a.m., there will be northbound lane reductions and a closure of northbound ramps at Pico, necessary for paving.

On Sunday, Oct. 22, from 10 p.m. to 5 a.m., expect northbound I-5 lane and ramp closures at Pico to allow for striping.

At 5 a.m. Monday, Oct. 23, Caltrans expects northbound traffic to be using the new configuration across the bridge.

In a weekly construction alert, the OCTA released a photo indicating how the shift in the freeway lanes will look.

The work is part of a $230 million widening of the freeway that began in February, 2014. The project is adding 5.7 miles of carpool lanes between San Clemente and San Juan Capistrano plus sound walls, extended connector lanes and an expanded I-5 interchange at Avenida Pico. Completion is expected in 2018.