the Arroyo Seco (110) Parkway, at the interchange with the Hollywood (101) Freeway. Running northwards on SR 110 to the northern terminus in Pasadena, the highway continued east onto Colorado Boulevard. When crossing North Baldwin Avenue, Colorado Boulevard becomes Colorado Street, and after it changes again to Colorado Place. Prior to the opening of the Arroyo Seco Parkway, US 66 began north on Broadway which curves east, ending at Mission Avenue. The highway then continues north on Mission which turns into Huntington Drive and then turns north onto Fair Oaks Avenue until meeting Colorado Boulevard where it turns east. After the extension to Santa Monica, the route moved to Figueroa Street from Sunset Boulevard to Colorado Boulevard until the opening of the Arroyo Seco. In Arcadia the highway continues eastwards through Arcadia, Monrovia, and Duarte as Huntington Drive, which it follows until the road crosses the San Gabriel River into Irwindale, becoming Foothill Boulevard after . In Azusa, the highway veers away from Foothill Boulevard, becoming Alosta Avenue. The city of Glendora renamed their segment of Alosta Avenue to Route 66; the highway is known as Foothill Boulevard again when it enters into San Dimas. Foothill Boulevard is numbered SR 66 from the interchange with the Foothill (210) Freeway in La Verne onward until the road crosses into San Bernardino, where it becomes Fifth Street. SR 66 ends at the 5th Street interchange with I-215 in San Bernardino. San Bernardino to the Arizona state line US 66 originally exited San Bernardino on Mount Vernon Avenue and Cajon Boulevard, which meandered its way up to Cajon Pass. US 66 originally followed 7th Street and D Street through Victorville then the National Old Trails Highway through Barstow, California (where it took on the name "Main Street") and across the Mojave Desert to Needles. US 66 followed Broadway Street through Needles, then crossed into Arizona on the Trails Arch Bridge (1916-1946) or the Red Rock Bridge (converted from railroad bridge in 1946, abandoned 1966, dismantled 1976). By 1964, most or all of this part of the route had been replaced by three Interstate highways, the first being I-215, known as I-15 in 1964. It followed I-215 from SR 66 up to I-15. After I-15, the highway followed I-40 until it got to the state line with Arizona in Needles. Major intersections Structures Restaurants Roy's Motel and Café was once the largest roadside business