Interstate 110

Interstate 110 is the designation assigned to multiple auxiliary Interstate Highways in the United States that serve as short spurs or connectors from the primary Interstate 10 into central business districts, ports, military bases, and urban neighborhoods. These routes exist in several states and metropolitan areas, linking to major surface streets, toll facilities, rail terminals, and river crossings; they are integral to networks centered on corridors such as U.S. Route 90, U.S. Route 90A, State Route 110 (California), and waterfront facilities including Port of Los Angeles and Port of Gulfport. Designed to manage freight, commuter, and defense-related movements, the various 110s interact with transportation agencies such as the Federal Highway Administration, California Department of Transportation, and Louisiana Department of Transportation and Development.

Route description

Segments designated 110 typically range from urban freeways under 20 miles to longer connectors approaching 30 miles, beginning at junctions with Interstate 10 and ending at city centers, waterfronts, or military installations. In southern California, one segment begins near San Pedro and moves northward toward downtown Los Angeles, interfacing with Harbor Freeway, Harbor Tunnel, Los Angeles River, Dodger Stadium, and the SigAlert-era arterial network; it carries elevated viaducts, local-express lanes, and HOV ramps. In the Gulf Coast region, another segment serves Pensacola, providing access to Pensacola Bay, Naval Air Station Pensacola, U.S. Route 98, and Airport Boulevard, while a separate Gulfport–Biloxi-area spur connects U.S. Route 49 to coastal resort districts near Mississippi Sound and the Gulf Islands National Seashore. Urban interchanges often tie into intermodal facilities like Union Station (Los Angeles) and regional transit such as Metrolink (California), Los Angeles Metro Rail, and local bus networks. Roadway design varies from depressed freeways adjacent to rail yards and historic districts to elevated structures over tidal flats and waterfront redevelopment zones.

History

The numbering and construction of these spurs trace to the 1956 Federal-Aid Highway Act and subsequent urban freeway building eras when states sought connectors between the developing Interstate Highway System and central ports, military installations, and downtowns. In California, the corridor that later bore the 110 designation evolved from early 20th-century auto routes connecting San Pedro Bay to Downtown Los Angeles and projects tied to the Port of Los Angeles expansion and Harbor Drive realignments. In the Gulf Coast, post-World War II growth around Naval Air Station Pensacola and tourism development at Biloxi and Gulfport prompted state highway commissions and the American Association of State Highway Officials to authorize spur routes. Major reconstruction campaigns in the late 20th and early 21st centuries responded to seismic concerns near Los Angeles County, hurricane damage after events such as Hurricane Katrina, and evolving federal programs like the Interstate Maintenance Discretionary Program. Key milestones included downtown freeway removals, deck park proposals adjacent to historic El Pueblo de Los Ángeles, and interchange rebuilds to accommodate movements to Los Angeles International Airport and container terminals.

Exit list

Exit numbering and configuration differ by state and urban context. In California, exits provide connections to principal arterials including State Route 1 (California), State Route 60 (California), and major streets serving Chinatown, Los Angeles, Boyle Heights, and Watts. Gulf Coast exit lists include ramps to U.S. Route 90 Alternate, municipal airports such as Gulfport–Biloxi International Airport and Pensacola International Airport, and access to waterfront casinos and convention centers in Biloxi and Gulfport. Many interchanges feature collector–distributor lanes to separate local traffic bound for neighborhoods like San Pedro or historic districts like Old Town San Pedro from through traffic heading toward downtown cores or military gates. Exit signage conforms to standards promulgated by the Manual on Uniform Traffic Control Devices and is coordinated with state departments of transportation for milepost-based or sequential numbering schemes.

Future plans and improvements

Planned projects vary across jurisdictions but commonly focus on seismic retrofitting, interchange simplification, multimodal integration, and resilience against coastal storms and sea-level rise. In metropolitan corridors, proposals include deck lids to create parks and mixed-use development above depressed sections, coordinated transit extensions to light rail and commuter rail systems, enhanced freight access to container terminals, and implementation of managed lanes and express tolling consistent with Urban Partnership Agreements. Coastal segments prioritize storm-hardening, elevating vulnerable spans, and upgrading drainage to address projections from National Oceanic and Atmospheric Administration and regional planning bodies. Funding sources typically combine federal highway programs, state transportation bonds, metropolitan planning organization allocations such as from Los Angeles County Metropolitan Transportation Authority, and public–private partnership models used elsewhere in the United States.

Auxiliary routes and related highways

Several related numbered and named highways interact with these spurs, including parent Interstate 10, auxiliary designations such as spurs and loops in adjacent metropolitan areas, and prior state route numbers reassigned during renumbering campaigns. Notable related corridors include U.S. Route 101 in southern California, State Route 1 (California) along coastal approaches, U.S. Route 90 across the Gulf Coast, and port access routes administered by local port authorities like the Port of Long Beach and Gulfport Harbor. Connections to military roadway networks near installations such as Naval Air Station Pensacola and joint civil–military planning with agencies like the Defense Logistics Agency shape operational priorities. Urban redevelopment efforts have also linked these corridors to transit-oriented development projects near Union Station (Los Angeles), waterfront revitalization in Biloxi, and freight corridor strategies coordinated with the Surface Transportation Board and regional metropolitan planning organizations.

Category:Auxiliary Interstate Highways