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I-5 (I-405 to SR-55) Irvine Tustin Project

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.


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PROJECT CONTACTS

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 environmental review process now complete, OCTA and Caltrans are currently undertaking the final design process. The project will be designed and constructed in two segments. One segment will span from approximately Yale Avenue to SR-55. The second segment will focus on the stretch of I-5 from the I-405 to Yale.

Project Improvements

Segment 1, Between I-405 And Yale

Anticipated Construction Schedule: Early 2026 to Late 2029

Segment Improvements

  • Add one general-purpose (regular) lane in each direction
  • Add auxiliary (on- and off-ramp merge) lanes
  • Convert existing buffer-separated HOV (carpool) lanes to continuous access HOV lanes
  • Modify ramp configurations on select interchanges

Segment 2, Between Yale Avenue and SR-55

Anticipated Construction Schedule: Early 2026 to Mid 2029

Segment Improvements

  • Add one general-purpose (regular) lane in each direction
  • Add auxiliary (on- and off-ramp merge) lanes
  • Convert existing buffer-separated HOV (carpool) lanes to continuous access HOV lanes
  • Modify ramp configurations on select interchanges
Project Map

Cost and Funding

The total estimated project cost is approximately $430.9 million and is funded by OC Go, formerly Measure M, Orange County's voter-approved Transportation Investment Plan, as well as, state and federal programs.

Resources

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Fact Sheet