🚧 Construction Alert As of Mar. 20: Interstate 5 (I-405 to SR-55)

As of March 20, 2026

如需了解有关本项目的更多信息，请联系 I-5 社区外展团队：i5Project405to55@octa.net 或致电 888-209-5550，或访问 octa.net/i-5project 。

이 프로젝트에 대한 자세한 내용은 I-5 커뮤니티 홍보팀(i5Project405to55@octa.net 또는 888-209-5550)으로 문의하시거나 octa.net/i-5projec t 를 방문해 주시기 바랍니다.

Join Us!

The I-5 Improvement Project (I-405 to SR-55) Community Outreach Team is scheduling upcoming virtual and in-person neighborhood meetings.

Look out for more meeting information!

Photo of a blue sky shows the Speed Limit 55 sign. Text on top reads "Slow For the Cone Zone. It's the Law! Slow Down in Work Zones." A traffic sign reads "Road Work Ahead".

Project Activities

Image is of a large construction vehicle leveling out some temporary asphalt that has been laid down onto the road

K-RAIL PLACEMENT &

TEMPORARY PAVING

WHAT:

Crews continue placing k-rail along northbound (NB) and southbound (SB) I-5 and will carry out activities for temporary paving. Nighttime full ramp closures and freeway lane closures on NB and SB I-5 will be necessary starting as early as 10 p.m. Friday night, March 20, and continuing intermittently until 5 a.m. on Saturday, March 28.

At least one lane in each freeway and surface street direction will be open to traffic at all times, unless otherwise specified. See closures section below for more information. *

*Freeway lane closures will occur regularly throughout the duration of the project’s construction.

RAMP & FREEWAY LANE CLOSURES

10 p.m. Friday night, March 20 to
5 a.m. Saturday morning, March 21

NB and SB I-5 Tustin Ranch Road on- and- off- ramps
NB and SB I-5 Outside lanes at Tustin Ranch Road

10 p.m. Monday night, March 23 to
5 a.m. Tuesday morning, March 24

SB I-5 Tustin Ranch Road on- and- off- ramps
SB I-5 Two outside lanes between Red Hill Avenue and Tustin Ranch Road

10 p.m. Tuesday night, March 24 to
5 a.m. Wednesday morning, March 25

SB I-5 Culver Drive on- and- off- ramps
SB I-5 Two outside lanes between Jamboree Road and Jeffrey Road

10 p.m. Wednesday night, March 25 to
5 a.m. Thursday morning, March 26

SB I-5 Culver Drive on- and- off- ramps
SB I-5 Two outside lanes between Jamboree Road and Jeffrey Road

10 p.m. Thursday night, March 26 to

5 a.m. Friday morning, March 27

SB I-5 Culver Drive on- and- off- ramps
SB I-5 Two outside lanes between Jamboree Road and Jeffrey Road

10 p.m. Friday night, March 27 to
5 a.m. Saturday morning, March 28

SB I-5 Culver Drive on- and- off- ramps
SB I-5 Two outside lanes between Jamboree Road and Jeffrey Road

This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.

Google Map

For a full list of weekly closures and detours, and the most up-to-date project information, please click on the project Google Map below.

Bookmark the closures and detours map above for quick access to real-time construction information. Click on the construction icons to view activities and closure and detour information. Plan for additional travel time through the area. Detour signs will be in place to assist motorists.

Stay Connected

We invite you to sign up for project updates so you’ll be the first to know about upcoming construction activities, traffic changes, and community meetings and when we’ll be out in your community at local events - we hope you’ll stop by and say hello!