Data Exchange & Archive

Regional Traffic Management is an important cross-county service that involves the exchange of real-time traffic information. A significant number of vehicle trips in the SCAG region cross one or more county boundaries, highlighting the importance of coordinating network surveillance and information broadcast activities among the different traffic management centers in the region. Projects such as the LA County IEN, RIITS and PeMS highlight efforts to integrate regional traffic management control and information sharing. A brief overview of each project is provided below.

LA County IEN

The Los Angeles County Information Exchange Network (IEN) is a system developed by the Los Angeles County Department of Public Works (DPW) that shares information and control of traffic control systems (TCS) throughout the county. The system is interoperable with different TCS packages by using open architecture components such as a standard software interface to connect the TCS to the IEN. Agencies participating in the IEN can share and access real-time intersection data to support enhanced arterial traffic management, improve traffic operations along multi-jurisdictional corridors and coordinate emergency response. Through 2009, the TCS of eight cities are connected to the IEN backbone, with the IEN and the City of Los Angeles (LADOT) TCS exchanging data through a separate interface. An interface between the IEN and signals in the LA County DPW network is currently being planned.

RIITS

The Regional Integration of Intelligent Transportation System (RIITS) network is the core project within the LA County Regional ITS Architecture that integrates different sources of transportation data from multiple agencies. The RIITS network features interfaces with transit agencies, Caltrans districts, the California Highway Patrol (CHP) and LADOT provide a source of transit, freeway, and arterial-based travel information. The RIITS network distributes the data to users through a XML data feed. The RIITS network currently supplies data to the MATIS traveler information service, and other information services providers who distribute the data to the public through a variety of applications. Future plans include new data interfaces with Caltrans Districts in neighboring counties and the Los Angeles County IEN.

LA Metro is currently developing an Archived Data Management Service (ADMS) that that will capture real-time data transmitted through the RIITS network. Ths ADMS will store three years of historical data for all modes of transportation from the various participating agencies. The ADMS database could be will be used to monitor system performance, support regional and corridor-level planning efforts and provide input for project funding applications. The ADMS is expected to support the MATIS program and support performance evaluation for future Express Lanes operations.

PEMS

The Freeway Performance Measurement System PeMS is a program that was developed jointly by the University of California at Berkeley and the California Department of Transportation to collect historical and real-time freeway data from the various freeway management systems in Caltrans for performance measurement calculations. PeMS is the primary tool for collecting data from loop detectors embedded into the freeway pavement on facilities across the state. The loop detector data is transmitted from Caltrans district traffic management centers over the Caltrans WAN to the PeMS host server which aggregates the data and provides performance measurement tools to review the data on its website. Additional interfaces include information from the CHP computer aided dispatch system (CAD) on incidents and lane closures, Caltrans District CMS messages, and FasTrak readers that report travel time on Bay Area toll facilities.

Real-time and historical traffic data can be accessed from the PeMS web portal for roadways in the SCAG region. Freeway data is collected and distributed by the District 7, 8 and 12 traffic management centers. A limited amount of arterial traffic data is available for the City of Los Angeles and the County of Los Angeles.

To learn about data exchange and archiving services in the region, view the information in the Existing and Planned Cross-County Services document and associated Turbo Architecture file.

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Executive Director’s Monthly Report, November 2024

California State Budget Reduces Barriers to Housing Production and Extends Deadline for Regional Early Action Planning (REAP 2.0) Program 

Earlier this week, the governor signed the 2025-2026 state budget, which includes a suite of reforms to reduce barriers to housing production.

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Executive Director’s Monthly Report, November 2024

Connect SoCal 2024 Implementation Update: Sustainable Communities Strategy Accepted

On May 7, the California Air Resources Board (CARB) informed SCAG that it had accepted SCAG’s determination that the Connect SoCal 2024 Regional Transportation Plan/Sustainable Communities Strategy (RTP/SCS) meets CARB’s greenhouse gas (GHG) emission reduction targets.

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Executive Director’s Monthly Report, November 2024

General Assembly Elects 2025-26 Board Officers

The General Assembly voted to approve the nominations for the SCAG 2025-26 Regional Council officers as recommended by the Regional Council: Hon. Cindy Allen (City of Long Beach) will serve as 2025-26 Regional Council president; Hon. Ray Marquez (City of Chino Hills) will serve as Regional Council first vice president; and Hon. Jenny Crosswhite (City of Santa Paula) will serve as Regional Council second vice president. Leadership also recognized Hon.

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Executive Director’s Monthly Report, November 2024

Surface Transportation Block Grant and Congestion Mitigation and Air Quality Improvement Program Call for Project Nominations Now Open

The federal fiscal year 2026-27 and federal fiscal year 2027-28 Surface Transportation Block Grant program (STBG) and Congestion Mitigation and Air Quality Improvement program (CMAQ) SCAG online application opened for all eligible applicants on March 31. This application will be available through May 16 at 5 p.m.

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Executive Director’s Monthly Report, November 2024

Surface Transportation Block Grant and Congestion Mitigation and Air Quality Improvement Program Guidelines Now Available 

On March 6, the SCAG Regional Council approved the federal fiscal year 2026-27 and federal fiscal year 2027-28 Surface Transportation Block Grant program (STBG) and Congestion Mitigation and Air Quality Improvement program (CMAQ) Program Guidelines.

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