Location: Interstate 15 between Cajalco Road in Corona and State Route 74 (Central Avenue) in Lake Elsinore

Construction: Could begin as early as 2025

Investment: $550-600 million (estimate for pre-construction, design, construction)


The Riverside County Transportation Commission, in partnership with Caltrans, is conducting preliminary engineering and environmental studies to support an Environmental Impact Report and Environmental Assessment for the proposed Interstate 15 Express Lanes Project Southern Extension.

The proposed project would add capacity by extending the I-15 Express Lanes, currently under construction, by an additional 14.5 miles. The proposed new segment would extend from Cajalco Road in Corona, through Temescal Valley, to State Route 74 (Central Avenue) in Lake Elsinore. The project proposes adding two tolled express lanes in both directions within the I-15 median to accommodate increasing traffic volumes in Riverside County.

Once built, the project would improve traffic operations and travel times, expand travel choice through carpooling and mass transit, increase travel time reliability, manage long-term traffic congestion, provide a cost-effective mobility solution, and expand and maintain compatibility with the regional express lanes network.

Other project features include widening up to 15 bridges, creating multiple express lane entrance and exit points, as well as building noise barriers, retaining walls, drainage systems, and electronic toll collection equipment and signs.

Source: RCTC