NO. 9 ROAD: I-5 HOV Improvement Project

Nov. 11, 2020

Freeway widening through heart of Orange County makes for sweet relief

(This feature published as "Your Tax Dollars at Work (Literally)" in November/December 2020 issue)

Hours of delay occurred daily on the I-5 barrier-separated HOV system through the heart of Orange County.

The Orange County Transportation Authority (OCTA) realized the need to improve the 3-mile segment between bottlenecks at the SR 55 and SR 57 freeway-to-freeway interchanges, and therefore included a project to address this need in its Measure M2/OC Go sales tax measure. Through the project development process, it was ultimately determined that removing the barriers that separated the HOV lanes from the general-purpose lanes and adding a second HOV lane in each direction would offer the relief needed.

The complex design called for the two southbound HOV lanes to be constructed where the previous (single) northbound and southbound HOV lanes had been, while realigning the two northbound HOV lanes into an area previously taken by northbound general-purpose lanes. By constructing a long retaining wall under the abutment of the existing railroad bridge, space was created to accommodate all northbound general-purpose lanes. This eliminated all widening in the southbound direction, and also avoided the need for several nonstandard design features.

An extraordinary challenge for this project was the demolition of the Main Street HOV drop ramp bridge structure, which required full freeway closures. The demolition was ultimately completed during a single weekend freeway closure.

“The OCTA is delighted to be part of a team that is dedicated to the success of this project,” said Niall Barrett, P.E., Msc, OCTA Program Manager. “The careful and strategic planning, thoroughness, and proactiveness throughout all phases of the project delivery speaks volumes to every member of the team.”

In total, the project added nearly 6 lane miles of HOV lanes. The project helped speed up commutes in this corridor, which will be traveled by 400,000 vehicles daily by 2035. Additionally, with congestion eased in the HOV lanes, overall travel times were improved, and more use of the HOV lane network has been encouraged. 

Project: I-5 High Occupancy Vehicle (HOV) Improvement Project between SR 55 and SR 57

Location: Santa Ana, California

Owners: Orange County Transportation Authority/California DOT

Designer: T.Y. Lin International

Contractor: OHL USA

Cost: $41.5 million

Length: 3 miles

Completion Date: August 31, 2020

Sponsored Recommendations

The Science Behind Sustainable Concrete Sealing Solutions

Extend the lifespan and durability of any concrete. PoreShield is a USDA BioPreferred product and is approved for residential, commercial, and industrial use. It works great above...

Proven Concrete Protection That’s Safe & Sustainable

Real-life DOT field tests and university researchers have found that PoreShieldTM lasts for 10+ years and extends the life of concrete.

Revolutionizing Concrete Protection - A Sustainable Solution for Lasting Durability

The concrete at the Indiana State Fairgrounds & Event Center is subject to several potential sources of damage including livestock biowaste, food/beverage waste, and freeze/thaw...

The Future of Concrete Preservation

PoreShield is a cost-effective, nontoxic alternative to traditional concrete sealers. It works differently, absorbing deep into the concrete pores to block damage from salt ions...