Interstate 110 (California)

Interstate 110 (California)
O · Public domain · source
State	CA
Route	110
Alternate name	Harbor Freeway, Harbor Transitway, Pasadena Freeway
Length mi	32.92
Direction a	South
Terminus a	near San Pedro
Direction b	North
Terminus b	near Pasadena
Counties	Los Angeles

Interstate 110 (California) is a major north–south Interstate Highway in Los Angeles County connecting San Pedro and Pasadena. The route serves the Port of Los Angeles, the Los Angeles International Airport corridor via connecting freeways, and downtown Los Angeles. It carries freeway and elevated sections known as the Harbor Freeway and the historic Pasadena Freeway, and interfaces with corridors including I‑405, I‑10, and US 101.

Route description

I‑110 begins at State Route 47 near the Port of Los Angeles in San Pedro and runs north through the Harbor Gateway before forming a major arterial through South Los Angeles into the central Los Angeles. The freeway provides direct connections to Terminal Island Freeway, Cabrillo Beach, and facilities at the Port of Long Beach. Moving north, I‑110 intersects I‑405 near West Athens and then meets SR 91 and I‑105 in proximity to Watts and Inglewood. Through University Park it approaches the Los Angeles Memorial Coliseum, Exposition Park, and downtown interchanges with I‑10 adjacent to the Los Angeles Convention Center. North of downtown, the route transitions to the historic Pasadena Freeway alignment, passing landmarks including El Pueblo de Los Ángeles Historical Monument, Chinatown, and the Arroyo Seco corridor before terminating near SR 134 in Pasadena where it connects with local arterials toward Old Town Pasadena and Rose Parade venues.

History

The southern portion of the corridor originated as the Harbor Freeway project in the 1940s and 1950s to serve the expanding Port of Los Angeles and wartime industries, intersecting early plans with the Pacific Electric network and the Yellow Cars. The elevated Harbor Freeway sections were constructed during the post‑war freeway boom alongside projects such as the Harbor Transitway and the Golden State Freeway expansions. The northern segment follows the 1930s Pasadena Freeway right‑of‑way, one of the first freeway‑style parkways in the United States, opening links between Downtown Los Angeles and Pasadena near the era of the Rose Bowl's national prominence. The route was incorporated into the Interstate system during the 1960s under designations influenced by planning agencies like the California Department of Transportation and regional bodies including the Southern California Association of Governments. Major reconstruction projects in the 1980s and early 2000s addressed seismic upgrades after events such as the Northridge earthquake and incorporated transit infrastructure from initiatives led by the Los Angeles County Metropolitan Transportation Authority.

Exit list

The I‑110 corridor contains urban interchanges serving industrial, cultural, and sports districts. Key interchanges from south to north include connections with SR 47 near the Port of Los Angeles, access to Harbor Boulevard and Gaffey Street in San Pedro, junctions with I‑405 near West Athens, an interchange with I‑105 serving Los Angeles International Airport access, connections to SR 91 and major arterials in Watts, the interchange with I‑10 adjacent to Downtown Los Angeles and Los Angeles Memorial Coliseum, northbound ramps toward Figueroa Street and Flower Street, then the split where I‑110 becomes the Pasadena Freeway alignment with exits serving Chinatown, Lincoln Heights, and the Arroyo Seco Parkway transition near Eagles Nest before terminating at SR 134 in Pasadena. Auxiliary ramps provide access to nearby landmarks such as Los Angeles International Airport, Staples Center, Los Angeles Union Station, and Rose Bowl Stadium.

Future and improvements

Planned improvements have been proposed by the Los Angeles County Metropolitan Transportation Authority and Caltrans District 7 to enhance capacity, resilience, and multimodal access along the corridor. Proposals include transitway upgrades linked to the Harbor Transitway and extensions coordinating with projects like the Crenshaw/LAX Line (K Line), interagency efforts with Port of Los Angeles planners, and seismic retrofits influenced by studies after the 1994 Northridge earthquake and ongoing high‑speed rail corridor planning. Environmental review documents have involved stakeholders including the South Coast Air Quality Management District and California Air Resources Board to address emissions near communities such as San Pedro, South Los Angeles, and Pasadena. Local initiatives by city councils in Los Angeles City Hall and the Pasadena City Council consider streetscape and active‑transportation connections to the Arroyo Seco Bike Path and E Line extensions.

Traffic and safety

I‑110 ranks among Southern California corridors monitored by agencies like the California Highway Patrol and the Federal Highway Administration for congestion, collision rates, and freight movement tied to the Port of Los Angeles and regional logistics networks such as the Intermodal container shipping chain involving Maersk and other carriers. Peak‑period congestion affects access to Downtown Los Angeles and interchanges with I‑10 and I‑405, contributing to countywide travel time variability studied by the Texas A&M Transportation Institute and regional planning scholars at institutions such as the University of Southern California and the California Institute of Technology. Safety improvements have included ramp reconfigurations, barrier replacements, and coordinated enforcement operations with the Los Angeles Police Department and Los Angeles County Sheriff's Department to reduce collisions near community hubs like Watts Towers and Exposition Park.

Public transit and usage

The Harbor Transitway and dedicated lanes on the corridor accommodate express services operated by Los Angeles County Metropolitan Transportation Authority and municipal operators linking Harbor Gateway and Pasadena with downtown. Bus rapid transit efforts connect with rail lines including the A Line and E Line to facilitate transfers to hubs like 7th Street/Metro Center station and Union Station. The corridor supports freight access to the Los Angeles and Long Beach ports and passenger movements for events at venues including Dodger Stadium, Crypto.com Arena, and Rose Bowl Stadium. Community groups, advocacy organizations such as the National Resources Defense Council and local coalitions engage with transit agencies over service equity, air quality, and transit‑oriented development near stations and interchanges.

Category:Interstate Highways in California Category:Transportation in Los Angeles County, California