

Heavy traffic is common along this stretch during weekends with traffic running between Los Angeles and Las Vegas. Heading more northerly, Interstate 15 progresses through Ivanpah Valley by the dry Roach Lake between Primm on the state line and Jean. Travelers traverse the dry bed of Ivanpah Lake before crossing the Clark County line into Nevada. Some elevation changes remain along the route, such as where the freeway drops into Cronise Valley or passes between the Soda Mountains. Long straight aways become the norm as Interstate 15 advances northeast to Barstow and across the Mojave Desert. A wide roadway split ensues north of Alray to Cajon Summit, with I-15 straightening out northeast to Apple Valley and Victorville. 66 parallels this stretch, with portions still drivable to Cajon. The freeway meanders north through Cajon Canyon between the San Gabriel and San Bernardino Mountains. Interstate 15 turns northeastward at Rancho Cucamonga to reconvene with I-215 at Cajon Canyon and Devore. I-215 ventures north through Menifee Valley to Perris and San Bernardino while I-15 stays west through Temecula Valley to Lake Elsinore, El Cerrito and Corona. There the route splits with Interstate 215 (former I-15E) at Murrieta. This stretch includes HOT lanes (Interstate 15 Express Lanes) running between the north and southbound main lines.Ĭontinuing through the North County area of San Diego, I-15 reaches Riverside County and Temecula Valley. Originating within Mission Valley in San Diego, Interstate 15 leads north through Murphy Canyon to Miramar Naval Air Station and Kearny Mesa as a busy commuter route to Poway, Rancho Bernardo and Escondido. Between these destinations, I-15 is an extremely busy highway, frequently backing up on holiday weekends in the Mojave Desert. Travelers westbound on I-40, I-70 and I-80 may easily transition onto southbound I-15 to connect to Las Vegas, Los Angeles, San Diego and International Destinations in Mexico.

Joining the desert southwest with the intermountain west, Interstate 15 provides a major link between the interior of Canada, several transcontinental corridors, Southern California, and Mexico.
