San Ysidro Port of Entry
The San Ysidro Port of Entry. Courtesy OnScene.TV

Workers will realign southbound Interstate 5 lanes at the border late Monday and early Tuesday as part of the San Ysidro border expansion project, according to the General Services Administration.

Phase 3 of the San Ysidro Land Port of Entry Modernization and Expansion project will open the four westernmost lanes of the newly constructed I-5 southbound freeway just south of the Camino de la Plaza Bridge.

In order to transition vehicle traffic from the current configuration to the new lanes, GSA workers will close the southbound I-5 for nine hours beginning at 10 p.m. Monday.

Traffic will be detoured to southbound Interstate 805 via the State Route 905 connector from that time through 7 a.m. Tuesday.

The Camino De La Plaza southbound I-5 freeway on-ramp will be closed at the same time, as will up to three southbound I-805 lanes.

Additional lanes will open in June.

Motorists have dealt with “Carmaggeddon” conditions at the border before as part of the lengthy upgrade. Travelers are advised to plan ahead for potential delays, monitor media, and traffic reports, and adhere to posted signage indicating changes to freeway patterns on affected roadways.

Southbound approaches to Mexico will remain open to vehicular and pedestrian traffic during the detour.

For more information about the San Ysidro LPOE project, visit

– Staff reports