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I-15/I-215 (South) Interchange

Temecula, California

Market Sector

Surface Transportation


Roadway Design

Services Provided




For the past couple of decades, traffic volumes and congestion have grown steadily along Interstate 15 (I-15) in Southern California as it passes through the cities of Temecula and Murrieta and branches into two parallel freeways. Ongoing development in the surrounding communities has also overloaded the existing local street connection points to I-15, necessitating a new highway interchange.

The City of Temecula is partnering with Caltrans District 8, FHWA, and the City of Murrieta to build this $156M program of three interchanges, including:

  • Construction of a new local street interchange on I-15 at French Valley Parkway in Temecula/Murrieta
  • Reconstruction of the Winchester Road interchange on I-15 in Temecula
  • Reconfiguration of the I-15/215 (South) interchange in Murrieta
  • Construction of a collector-distributor (CD) and braided ramps system designed to connect the three interchanges and significantly improve traffic operations by reducing or eliminating weaving

Project Highlights:

  • Reconfiguration of the I-15/215 interchange
  • Two local street interchanges
  • Ten new or widened bridge structures
  • 18 retaining and sound walls, ranging up to 48 feet high
  • Collector-distributor road and braided ramps system, both northbound and southbound

T.Y. Lin International (TYLI) is the prime consultant for the preparation of plans, specifications, and estimate (PS&E) and completion of all related efforts including project management, engineering, environmental, right-of-way, utilities, permitting, and community acceptance. Significant technical challenges include large walls, construction of bridges over creeks and environmentally sensitive areas, relocation and protection of major utilities, drainage improvements, and both construction-related and permanent storm water pollution protection measures.

Because of the confluence of two major freeways, phasing and traffic control for the construction of the new interchange and CD/braided ramps system are critical issues that will be carefully designed and coordinated so that construction can be done efficiently and with minimal disruption to the traveling public.

Ultimate completion of this high priority project will improve congestion, safety, operations, and access within the community.