Congestion Management Program

Every year, Alameda CTC collects and analyzes systemwide data on the multimodal transportation system and demand to produce a Performance Report that identifies important regional and countywide trends.

The 2024 Performance Report, published in April 2025, draws on the latest data available to better understand rapidly emerging trends in transportation. Previous Performance Reports are available on Alameda CTC's Reports webpage, under Performance Report.

The annual Performance Report is supplemented by Countywide Fact Sheets, which provide a snapshot of the county's transportation system. The following fact sheets were last updated in early 2025 to reference data from 2024 or the latest year available. Detailed source information for all Performance Report Fact Sheets can be found in this citation document.
Every two years Alameda CTC collects and analyses detailed multimodal data on a roughly 550-mile network of freeways, highways, and arterials. This includes state-mandated reporting of auto speeds and level of service, along with transit speeds and active transportation activity within Alameda County.

2024 Multimodal Monitoring Cycle

Transportation system performance began to stabilize during the 2024 multimodal monitoring cycle as pandemic-related shifts continued at a slower rate. Auto and transit speed data for the 2024 multimodal monitoring cycle were collected during the spring of 2024, while active transportation counts were collected in the fall of 2024. A more detailed description of the methodology and full results from the 2024 multimodal monitoring cycle can be found in the technical appendices available below:

Previous Monitoring Results

Results from previous multimodal monitoring cycles can be found here.
2025 Congestion Management Program
Alameda County's Final Draft of the 2025 Congestion Management Program (CMP) is pending approval at Alameda CTC's October 2025 Commission meeting. The current 2023 CMP was approved by the Commission in October 2023. Previous versions can be accessed below.

2023 Congestion Management Program
Alameda County's 2023 Congestion Management Program (CMP) was approved at Alameda CTC's October 2023 Commission meeting. Previous versions can be accessed below. Previous CMP Updates
What is the CMP?
State legislation regarding CMPs, initially passed in 1991, aims to encourage coordination between agencies to effectively manage congestion, prioritize multimodal solutions to improve air quality and support economic objectives, and further integrate land use planning and development with the transportation system.

In order to address these objectives, the legislation required every urbanized county in the state to establish a Congestion Management Agency (CMA) that conducts CMP activities on a two-year cycle, culminating in adoption of the CMP itself. Current CMP legislation defers considerable authority to CMAs to develop and update CMPs, but mandates that a CMP incorporate the following five key elements:

  1. Biennial monitoring of congestion on a designated roadway network
  2. A multimodal performance element
  3. A travel demand management element
  4. A land use analysis program
  5. A capital improvement program
As the state-designated CMA for Alameda County, Alameda CTC is required to update the CMP every two years. The CMP itself is a short-range plan that includes a variety of congestion and travel demand management strategies, programs, and projects that support long-range planning efforts, including the Countywide Transportation Plan, the Regional Transportation Plan, and the Sustainable Communities Strategy. Alameda County’s CMP meets, and often exceeds, legislative requirements by describing efforts to monitor and improve the performance of every mode of travel. This includes monitoring not only roadway congestion and major land use developments as mandated, but transit performance, bicycle and pedestrian activity throughout the county.

The CMP and SB 743
Current CMP legislation is in conflict with SB 743. The metric used to measure performance is at the heart of this conflict. CMP legislation requires use of a delay-based metric, Level of Service, to measure roadway performance. However, recently amended CEQA guidelines based on SB 743 require vehicle miles-traveled (VMT) as the primary metric for traffic impacts. This move away from LOS to VMT supports Greenhouse Gas (GHG) reduction goals, multimodal performance measurement, and is in line with the Complete Streets practice. Alameda CTC is evaluating strategies to resolve this legislative conflict.

The countywide travel model is an essential tool for transportation planning that allows Alameda CTC and its partner agencies to anticipate and forecast the potential impacts of local land development decisions and changes to infrastructure on travel patterns in the county. The travel model is periodically updated to be consistent with the most recent land use and socio-economic database of the Association of Bay Area Governments (ABAG) and assumptions of the Metropolitan Transportation Commission (MTC)’s regional travel demand model.

The current model is the Alameda-Contra Costa (AlaCC) Travel Model, which was developed to be consistent with the land use and transportation assumptions in Plan Bay Area 2050. Alameda CTC partnered with the Contra Costa Transportation Authority (CCTA) to jointly develop this new activity-based model, which serves as the countywide travel model for both Alameda and Contra Costa counties. This model covers the nine Bay Area counties and San Joaquin County but includes a higher level of land use and transportation network detail in Alameda and Contra Costa counties. The AlaCC Model uses MTC’s Travel Model 1.5 as the base structure and is an activity-based model, which supports consistency with regional modeling and streamlines model updates for regional transportation plans.

An overview of the AlaCC Model development process and AlaCC key features can be found in the 2025 CMP Update.

AlaCC Model outputs and documentation can be found on the AlaCC github, including:

AlaCC TAZ boundaries are included and available for download in the VMT Mapping Tool. The Mapping Tool, which was developed to support the implementation of SB 743 requirements and updated in September 2025 to incorporate AlaCC estimates, maps VMT per capita and per employee at the TAZ level, and specifies citywide, planning area, county, and regional averages for each metric. More information on the VMT Mapping Tool and SB 743 is available here.

AlaCC Model outputs are publicly available on the AlaCC github page. To access inputs and apply the AlaCC Model, users must have an executed Model Use Agreement on file with Alameda CTC and submit a signed request letter for each project application.

To request use of the AlaCC Model in Alameda County, please contact Shannon McCarthy (smccarthy@alamedactc.org).

Complete Model Documentation for the Prior Model Updated in 2019
Complete Model Documentation for the Prior Model Updated in 2015

Information on SB 743, including the Alameda CTC VMT Reduction Estimator Tool and VMT Mapping Tool, can be found on the SB 743 webpage here.