Our regional strategies in housing, transportation, and economic development improve the quality of life for Western Riverside County and San Diego residents.


This section includes information on how the I-15 corridor that is shared between San Diego and Riverside counties can be enhanced to increase trip mobility and transportation efficiency, improve commuter safety, and expedite the movement of goods. These goals and strategies were developed based on the County Line Study conducted by Caltrans and Districts 8 and 11. Caltrans supported grant-funded efforts to develop a strategic implementation plan based on the results of the County Line Study.

Fast Facts

I-15 is used extensively as a commuter and truck route, providing access to major employment centers and goods movement in San Diego, Riverside, and San Bernadino counties.

Peak-period traffic into the San Diego region from Riverside County has leveled off over the last several years, as indicated in Figure 8. The actual growth in traffic on a year-to-year basis peaked in 2005 and, in 2008, actually has begun to decrease. The current volume of 17,517 is for weekday, southbound traffic during the morning peak period from 5 until 8 a.m. This could be attributed in large part to the skyrocketing gas prices that began in 2007, coupled with the economic crisis, which began in 2008.

Peak-period traffic on the existing eight-lanes of the I-15 is projected to surpass its capacity sometime between 2015 and 2030. The cross-section between San Diego and Riverside Counties will start to reach capacity in 2012 and will reach severe congestion by 2015 if improvements are not made.

Key Strategies

Riverside and San Diego coordinated future transportation infrastructure plans to meet the projected demands in the most effective ways possible, while taking into consideration financial and engineering constraints

Strategy #1: Implement the I-15 High Occupancy Vehicle (HOV)/Managed Lanes System

Strategy #2: Identify and further develop selected short- and long-term transportation projects on an interregional basis

Strategy #3: Preserve transportation Rights-of-Way and implement priority measures through the Caltrans development process