Southern California’s I-405 design moves forward

28 Jun 2017

A joint venture of Lochner, Moffatt & Nichol, and Arup will provide full engineering services for the Orange County Transportation Authority’s $1.9bn highway infrastructure project.

The 370,000 drivers who travel Interstate 405 in Southern California every day can look forward to relief from the intimidating traffic conditions they have faced on the freeway for years. The $1.9bn I-405 Improvement Project, which is being led by the Orange County Transportation Authority (OCTA) in partnership with Caltrans, aims to shorten commute times for hundreds of thousands of motorists.

"The start-up of a large design-build project can be particularly challenging, as design, construction, and owner-side teams are mobilised and work together. Considering the size and complexity of this project, the cooperation, partnering, and collaboration between all the various entities has been remarkable. The I-405 project has been exemplary in establishing and maintaining a one-team atmosphere that promotes project progress.”

— Scott Lucas, H.W. Lochner design manager

The expansion project will improve 16mi of I-405, adding one regular lane in each direction and improving freeway entrances, exits, and bridges. It will also construct the 405 express lanes, which will allow solo drivers to speed up their commute for a toll, while carpoolers may ride in the lanes for free.

“Arup, as part of Pacific Infrastructure 405 Designers, is extremely excited to be joining with OC 405 Partners and with OCTA and Caltrans to deliver this important project for the many communities of Orange County. We understand that designing and delivering this complex project will require complete collaboration between all parties, and that total dedication is critical to achieving OCTA’s vision for the improvements to this important transportation corridor.”

— Richard Prust, Arup Principal and project director


  • Related markets


    Wherever new or better roads help communities prosper, we can make original solutions possible.

    View all markets


Rebecca Maloney

T+1 617 864 2987

F+1 617 864 6178