This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| State Route 138 | |
|---|---|
| Name | State Route 138 |
| Type | State highway |
| Route | 138 |
| Direction a | West |
| Direction b | East |
State Route 138 is a state highway that traverses a mix of urban, suburban, and rural landscapes, connecting multiple counties and serving as a regional arterial for commerce, commuter traffic, and freight movement. The route passes near or through significant municipalities, transportation hubs, natural landmarks, and historical sites that tie into broader networks such as interstate corridors and rail lines. Its role intersects with planning authorities, toll agencies, metropolitan transit districts, and environmental regulators.
The corridor begins near a major interchange with an Interstate 5-adjacent urban center, then proceeds through suburban townships and exurbs abutting the San Gabriel Mountains, skirting municipal boundaries with communities like Palmdale, Lancaster, Victorville, and Hesperia. Along the alignment it crosses river systems including the Los Angeles River and tributaries of the Santa Ana River, and parallels freight lines operated by Union Pacific Railroad and BNSF Railway. The route provides access to airports such as Bob Hope Airport and regional facilities linked to Los Angeles International Airport connectivity, and intersects with freeway arteries including Interstate 210, Interstate 15, and U.S. Route 101. Roadway typologies vary from limited-access expressway segments near industrial parks to two-lane rural stretches adjacent to protected lands administered by the U.S. Forest Service and the California Department of Fish and Wildlife. Transit connections include park-and-ride lots serving Metrolink commuter rail lines and bus interchanges operated by agencies like the Southern California Association of Governments and municipal transit districts.
The corridor evolved from early wagon roads used during the California Gold Rush era and later aligned with 20th-century auto trails promoted by organizations such as the Lincoln Highway Association and the Auto Club of Southern California. Mid-century upgrades were influenced by federal funding programs tied to the Federal-Aid Highway Act of 1956 and state bond measures administered by the California Department of Transportation. Significant historical events shaping the route include alignment shifts following seismic assessments after the Northridge earthquake and federal environmental directives from the National Environmental Policy Act hearings. Economic development along the highway was catalyzed by logistics growth at nearby ports including the Port of Los Angeles and the Port of Long Beach, and by defense-related facilities associated with Edwards Air Force Base and aerospace contractors like Lockheed Martin and Northrop Grumman.
Key junctions connect the route to principal corridors and urban centers: interchanges with Interstate 5, Interstate 210, and Interstate 15; at-grade crossings with state routes such as State Route 14 and State Route 18; and linkages to federal highways including U.S. Route 101. The route also interfaces with regional arterials leading to downtowns such as Los Angeles, San Bernardino, and Riverside, and provides access ramps to major freight terminals serving the Trans-Pacific trade network. Rail grade separations coordinate with Amtrak and commuter services like Metrolink, while tolling provisions in adjacent corridors are managed by authorities such as the Transportation Corridor Agencies.
Traffic volumes along the highway reflect commuter flows between suburbs and metropolitan job centers, freight movements to inland logistics hubs, and seasonal tourist travel toward recreation areas such as the Angeles National Forest and desert destinations near Joshua Tree National Park. Peak-hour congestion correlates with employment centers in Downtown Los Angeles, distribution clusters near the Inland Empire, and event-related surges tied to venues like the Staples Center and regional sports arenas. Safety and performance metrics are monitored by the Federal Highway Administration and state agencies, which use data from traffic sensors, weigh-in-motion stations, and incident reports coordinated with local sheriff departments and municipal police agencies.
Planned improvements include capacity expansions, interchange reconstructions, and multimodal enhancements to integrate bus rapid transit corridors supported by metropolitan planning organizations such as the Metropolitan Transportation Authority and the Southern California Association of Governments. Environmental mitigation projects coordinate with entities like the U.S. Fish and Wildlife Service to protect riparian habitats near the Santa Ana River. Funding proposals reference state infrastructure bonds, federal grants under programs administered by the U.S. Department of Transportation, and public-private partnerships engaging firms akin to Fluor Corporation and AECOM. Climate resilience measures under consideration mirror guidance from the California Air Resources Board and the Governor's Office of Planning and Research.
The corridor intersects and is functionally related to several numbered routes and transportation designations, including interstates (Interstate 5, Interstate 15, Interstate 210), U.S. routes (U.S. Route 101), and state-maintained highways like State Route 14 and State Route 18. Nearby transit projects such as Metrolink expansions and regional bus rapid transit initiatives by agencies including the Los Angeles County Metropolitan Transportation Authority inform multimodal coordination. Freight corridor planning ties into national initiatives overseen by the Freight Advisory Committee and federal programs administered by the Surface Transportation Board.
Category:State highways