I-5 (I-405 to SR-55)
I-5 Improvement Project (I-405 to SR-55)
To address current and future traffic demand, the Orange County Transportation Authority (OCTA), in partnership with the California Department of Transportation (Caltrans), is improving I-5 from north of Interstate 405 (I-405) to State Route 55 (SR-55). OCTA and Caltrans are working with the neighboring cities of Irvine and Tustin.
Project Overview
Interstate 5 (I-5) is essential to Orange County's mobility, economy and quality of life. Every day more than 275,600 motorists drive this segment of I-5, through the cities of Irvine and Tustin, to reach residential, commercial, educational and employment destinations.
With the final design process nearly complete, the project will be constructed in two segments. One segment will span from approximately I-405 to Yale Avenue. The second segment will focus on the stretch of I-5 from Yale to SR-55.
Project Improvements
Segment 1, Between I-405 And Yale Avenue
Anticipated Construction Schedule: Spring 2026 to Mid 2029
Segment Improvements
- Add one general-purpose (regular) lane in each direction
- Add auxiliary (on- and off-ramp merge) lanes
- Modify ramp configurations on select interchanges
Segment 2, Between Yale Avenue and SR-55
Anticipated Construction Schedule: Spring 2026 to Late 2029
Segment Improvements
- Add one general-purpose (regular) lane in each direction
- Add auxiliary (on- and off-ramp merge) lanes
- Modify ramp configurations on select interchanges
Project Map
Cost and Funding
The total estimated project cost is approximately $716 million and is funded by local, state and federal programs.