Interstate 110 California
Connecting the San Pedro community with Downtown in Los Angeles, Interstate 110 follows the Harbor Freeway north from California State Route 47 to Interstate 10 (Santa Monica Freeway). A heavily traveled route, I-110 serves as a major commuter route through the heart of South Los Angeles as well as a commercial corridor to the Ports of Los Angeles and Long Beach via the Vincent Thomas Bridge.
A portion of the Harbor Freeway one mile south of Interstate 10 was upgraded with the addition of a separate transit and carpool roadway. It includes an elevated section above the below grade portion of the Harbor Freeway. The viaduct ends with a stub by the W 28th Street overpass.
State Route 110 extends north from the I-110 portion of the Harbor Freeway to the Four-Level Interchange with U.S. 101 (Hollywood Freeway). This section is partially signed as I-110 in the southbound direction, but not considered part of the Interstate highway. SR 110 continues northeast from U.S. 101 to I-5 (Golden State Freeway) and South Pasadena along the Arroyo Seco Parkway (Pasadena Freeway).
Interstate 110 was commissioned between 1964 and 1968 along the westernmost extent of the San Bernardino Freeway. It linked I-5/10 with U.S. 101 and the previous alignment of I-105 east of Downtown Los Angeles. I-105 was subsequently dropped from the Santa Ana Freeway, leaving U.S. 101 alone south to I-5 and I-10. I-110 was renumbered as unsigned State Route 10. The American Association of State Highway Officials (AASHO) approved the deletion of both routes on June 30, 1970.
Source: December 31, 2021 Interstate Route Log and Finders List
I-110 Annual Average Daily Traffic (AADT)
Source: 2017 Traffic Volumes – Caltrans Traffic Census Program
SR 11 was replaced by Interstate 110 while SR 7 became Interstate 710. SR 7 was reused for a new border crossing linking I-8 with Mexicali in Imperial County. SR 11 is designated along a freeway between SR 905 and the Mexican border at Otay Mesa, San Diego.
Interstate 110 was established again in 1978 along a different stretch of highway: the Harbor Freeway (California State Route 11). Having been built in stages through the 1950s and 1960s, the Harbor Freeway was one of the oldest freeways in the Los Angeles Basin. The first sections were constructed as part of U.S. 6, which previously followed Figueroa Street from Downtown Los Angeles to San Pedro.
When U.S. 6 was decommissioned in 1964, the Harbor Freeway was redesignated as SR 11. The state route also followed the adjacent Pasadena Freeway to the north. The American Association of State Highway and Transportation Officials (AASHTO) approved the I-110 designation along the Harbor Freeway from SR 47 to I-10 on June 25, 1979. The remainder of SR 11 was renumbered SR 110.
State Route 110 northeast from Chinatown to Glenarm Street in Pasadena follows one of the old alignments of U.S. 66. Built in the 1940s and 1950s, this section of SR 110 follows Arroyo Seco Parkway. Many of the original substandard sections of the Arroyo Seco Parkway remain, including short acceleration and deceleration lanes, stop signs at the freeway entrance ramps, minimal shoulders, the Figueroa Tunnels, sharp turns and narrow lanes. Due to its historical status, many of these features will be not be modified.
SR 110 previously extended both north of the Pasadena Freeway and south of the Harbor Freeway (I-110) along surface streets. The northern segment ran between Glenarm Street and Colorado Boulevard (former U.S. 66). It was relinquished to the city of Pasadena on August 31, 2000.1 The southern leg of SR 110 followed Gaffey Street through San Pedro. Relinquished by the state in June 2009, it connected I-110 with the cruise ship port.
North End – Downtown Los Angeles, California
I-10 (Santa Monica Freeway) advances east to the University Park community in Los Angeles and the exchange with I-110 / SR 110 (Harbor Freeway). 05/31/15
The Santa Monica Freeway eastbound separates with an extended collector distributor roadway for I-110 (Harbor Freeway) south to San Pedro and Grand Avenue. A left exit departs from the mainline to SR 110 (Harbor Freeway) north to Pasadena. 05/31/15
Exit 13 separates from the Santa Monica Freeway westbound above Grand Avenue. A cloverstack interchange joins I-10 with I-110 south and SR 110 north.
Throwback – West at
Green outs on guide signs for I-110 and SR 110 covered up shields for SR 11 or U.S 6. U.S. 6 followed the Harbor Freeway from the Golden State Freeway (U.S. 99 / I-5) south to the Pacific Coast Highway (U.S. 101 Alternate / SR 1). Signs for U.S. 6 were removed from the Harbor Freeway in 1964, the same year in which U.S. 6 was decommissioned south of Bishop. 08/24/04
South End / Gaffey Street – San Pedro, Los Angeles, California
South at / Gaffey Street
Interstate 110 southbound concludes at a directional T interchange with SR 47 (Seaside Freeway) east and Gaffey Street at San Pedro. 07/09/18
Gaffey Street north at