 After entering Kern County, the freeway sharply descends for from at the Tejon Pass to at Grapevine near the southernmost point of the San Joaquin Valley, approximately south of Bakersfield and south of its interchange with SR 99 at Wheeler Ridge.From SR 99 to south of Tracy, I-5 is known as the Westside Freeway.It parallels SR 33, skirting along the far more remote western edge of the Central Valley, and is largely removed from the major population centers such as Bakersfield, Fresno and Modesto; other state highways provide connections.