When the freeway reaches the East Los Angeles Interchange east of downtown Los Angeles, I-5 becomes the Golden State Freeway. The route continues through the San Fernando Valley and then crosses the Newhall Pass through the Santa Susana Mountains into the Santa Clarita Valley. The interchange with State Route 14 (SR 14) is unusual in that truck traffic is separated into its own lanes for both the mainline of the freeway and the transition ramps to and from SR 14. For about a stretch between the Santa Clarita Valley and Pyramid Lake, the northbound and southbound lanes separate and cross sides, with the southbound lanes running to the east of the northbound ones. At that point, the Golden State Freeway rises sharply to the north through the Grapevine to eventually reach the second-highest point of its entire length, the Tejon Pass (elevation ). It then goes through the Tehachapi Mountains. Path 26 power lines generally follow the freeway along this stretch. The freeway then descends sharply for at Tejon Pass to around at Grapevine near the southernmost point of the San Joaquin Valley, approximately south of Bakersfield and south from where SR 99 splits away from it in Wheeler Ridge.