 From there, it head northeast on Downtown San Jose surface streets, roughly following the roads of Oakland Rd, Main St, and SR 238, eventually reaching the present day Interstate 580 (I-580), then east through the cities Pleasanton and Livermore on Castro Valley Rd, Dublin Canyon Rd, and Altamont Pass Rd.to the present-day separation between I-580 and I-205.From here, US 48 continued east on 11th St. (now I-205 Business (I-205 BUS)) through Tracy to former US 99W, now roughly I-5.