In the past few years, SANDAG and Caltrans have worked with stakeholders to complete a preliminary screening of project alternatives for the I-5/SR 78 interchange. Improvements could include direct freeway-to-freeway connectors from southbound I-5 to eastbound SR 78 and westbound SR 78 to southbound I-5, direct access ramps to Managed Lanes, and transit vehicle linkage.
Caltrans also is investigating the feasibility of interim operational improvements to improve the flow of traffic entering I-5 from SR 78.
More information is available on the project page.
SANDAG and Caltrans have evaluated a proposal to construct two Managed Lanes, one in each direction, on SR 78 between I-5 and I-15. Other major improvements include bridge replacement/widening, ramp relocations, and street realignment operational improvements. The goal of the project is to improve the overall movement of people and goods between I-5 and I-15 on SR 78 by implementing the most cost-effective strategies while minimizing impacts to the surrounding communities. The environmental phase is partially funded, while design, and construction are currently unfunded.
Improvements have been planned and are anticipated to be implemented in the near future along eastbound and westbound SR 78. Activities include pavement resurfacing, bridge rails, ADA ramps, culvert restoration, and a new westbound auxiliary lane between Nordahl and Twin Oaks Valley roads in San Marcos. Intelligent Transportation System technology improvements will help prepare for an automated future, improve traveler information, and reduce congestion and emissions.
In addition, Caltrans completed construction on eastbound and westbound auxiliary lanes between Twin Oaks Valley Road and East Barham Drive in 2018.
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