I-215 Interchange Improvement Project
Garbani Road
Background
This project evaluates potential transportation improvements along Interstate 215 in the City of Menifee between the Newport Road and Scott Road interchanges in Riverside County, California. As the city continues to experience rapid population and development growth, traffic demand along this corridor is expected to increase significantly. Existing conditions, including closely spaced interchanges, limited east–west connectivity, and insufficient multimodal infrastructure, contribute to congestion and restrict mobility within the area. The study focuses on assessing current and future transportation needs and explores the feasibility of a new interchange at Garbani Road to improve traffic operations, enhance regional connectivity, and support long-term growth in the Menifee community.
Alternatives
Garbani Road and Antelope Road
Menifee, CA
Alternative 0: No Build
Leaves Garbani Road, Antelope Road, and I-215 unchanged, requiring no funding or environmental impact but failing to address future traffic growth and congestion.
Alternative 1: Spread Diamond Interchange
Realigns Antelope Road and Garbani Road with a bridge over I-215 to improve connectivity while having the lowest environmental impact but limited ability to reduce future traffic demand.
Alternative 2: Partial Cloverleaf Interchange
Realigns Antelope Road and Garbani Road and adds a bridge with ramps and loops to improve connectivity and reduce congestion at nearby exits.
Alternative 3: Two Quadrant Cloverleaf Interchange
Constructs a bridge across I-215 with ramps in the northern quadrants to improve traffic flow but restricts left turns and increases right-of-way acquisition risk.
Deliverables
The Preliminary Environmental Analysis Report (PEAR) provides a comprehensive review of the environmental investigations based on environmental impacts such as biological, paleontological, climate change, hazardous materials, and even some social impacts such as Cultural, visual, and community impacts.
The Project Study Report (PSR) summarizes the technical analyses, design concepts, and environmental considerations used to identify a recommended alternative. The PSR serves as the basis for future project development and coordination with local and regional agencies.
The Intersection Safety And Operational Assessment Process (ISOAP) provides a comprehensive review of the traffic investigations based on the interaction between the freeway mainline, ramp terminals, pedestrians, cyclists, and transit. The ISOAP uses existing conditions, active transportation facilities, transit routes, crash analysis, and Safe Systems Approach in the data analysis.
Benefit/Cost Analysis
Evaluates the benefit to cost ratios for each proposed alternative based on the total vehicle delays, overall traffic safety, emissions rates, and reliability.
Construction Staging Plan
Presents plans for the construction phases for the preferred alternative.
Cost Estimate
Displays the total project costs based on costs for earthwork, roadway items, ROW, and structure items for each alternative.
Weighted Decision Matrix
Evaluates ratings based on eight criterias and the rating for each alternatives to choose the most feasible alternative.
Our Team
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Khang Ethan Nguyen, EIT
Project Manager
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Luis Carrillo
Environmental Lead
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Justin Mills, EIT
Environmental
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Angelica Ramos
Environmental
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Christian Hernandez, EIT
Traffic Lead
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David Bui
Traffic
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Jabez Java, EIT
Traffic
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Thienly Nguyen
Traffic
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Nathan Chau, EIT
Co-Design Lead
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Andrew Tran, EIT
Co-Design Lead
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Joseph Kim, EIT
Design
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Fernando Sanchez
Design
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Dr. Yongping Zhang, PE
CPP Faculty Advisor
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Justine Niu, PE
Caltrans District 8 Advisor
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Jason Collado, PE
Caltrans District 8 Advisor