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Overnight Closures of Interstate 5 Continue for Mid-Coast Trolley Construction in October

Full closures of southbound lanes required for construction of Trolley overcrossing

San Diego CA— On October 1, intermittent overnight closures will resume on Interstate 5 (I-5) for construction of the future Mid-Coast Trolley overcrossing south of Nobel Drive.

During the early morning hours on Tuesday, October 1, a closure will be in place for crews to grade falsework, which is the process of adjusting falsework – or wooden support beams – to the proper elevation. On Wednesday, October 2, an overnight closure will be in place for crews to pour concrete to form the Trolley bridge.

The following closures will be in place:

Tuesday, October 1: 

  • Full closure of southbound lanes from the I-5/I-805 Interchange to La Jolla Colony Drive from 12 a.m. to 5 a.m.

Wednesday, October 2, through Thursday, October 3:

  • Full closure of southbound lanes from the I-5/I-805 Interchange to La Jolla Colony Drive from 9:30 p.m. to 5 a.m.

Detour routes will be available via southbound I-805 and westbound State Route 52. Additional closures of northbound I-5 will be required and notices will be provided at a later date.

*Schedules are subject to change

The Mid-Coast Trolley Project will extend Trolley service from Old Town Transit Center to the University community, serving major activity centers such as Mission Bay, the VA Medical Center, UC San Diego, and University Towne Centre. Nine new stations will be constructed. Major construction work began in 2016, with service anticipated to begin in late 2021.

To learn more, visit KeepSanDiegoMoving.com/MidCoast.


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The San Diego Association of Governments (SANDAG) is the San Diego region’s primary public planning, transportation, and research agency, providing the public forum for regional policy decisions about growth, transportation planning and construction, environmental management, housing, open space, energy, public safety, and binational topics. SANDAG is governed by a Board of Directors composed of mayors, council members, and supervisors from each of the region’s 18 cities and the county government.