State Route 35 (SR 35), generally known as Skyline Boulevard for most of its length, is a mostly two-lane state highway in the U.S. state of California. It runs along the ridge of the Santa Cruz Mountains from the high point of State Route 17 near Lexington Reservoir in Santa Clara County to State Route 1 just south of Daly City in San Mateo County, where it crosses SR 1 and loops around Lake Merced to become Sloat Boulevard in San Francisco. SR 35 then continues along Sloat Boulevard until it reaches its terminus when it meets SR 1 again at 19th Avenue. Because of its high elevation and location, it is one of the few places on the southern portion of the San Francisco Peninsula from which the San Francisco Bay and the Pacific Ocean are both visible at the same time. It also provides scenic views of the Silicon Valley metropolitan area. It was originally designated State Route 5 (SR 5), but this had to be changed with the creation of Interstate 5 (I-5) in 1964 to avoid confusion between the two roads. Route description The highway begins at the junction of Summit Road and State Route 17, at Patchen Pass. While SR 17 traverses the pass outright, SR 35 primarily is on the ridgeline. The portion of SR 35 from SR 17 to Bear Creek Road is called Summit Road. The highway then merges with Bear Creek Road for a few miles before becoming Skyline Boulevard. It bears the name Skyline Boulevard for a majority of its route along the ridge of the Santa Cruz Mountains to the west of Silicon Valley, passing by cities such as San Jose, Saratoga, and Palo Alto. The southern portion of the road, starting at Highway 17 and ending at Black Road, is mostly a narrow and winding country road without a double-yellow line. However, the road has been upgraded to 2 lanes beginning at Black Road, and remains in this configuration until it merges with Interstate 280 north of California State Route 92. The road reaches its highest elevation near Sanborn Skyline County Park at about 3,000 ft (914 m). The road passes through the small community of Sky Londa where it intersects State Route 84. The ridge that the road follows forms the border between Santa Cruz and Santa Clara counties. However, the boundary is so irregular that the