Use GTFS schedule trips, stop_times, shapes, and stops to estimate whether corridor segments have scheduled headways of 20 minutes or less.

This data set contains high-quality transit corridors in the nine-county San Francisco Bay Region as defined in the California Public Resources Code, Section 21155 (b)(3), consistent with Senate Bill 375:Existing fixed-route bus corridor with headway of 15 minutes or better during both the morning and evening peak periods; orFixed-route bus corridor with headway of 15 minutes or better during both the morning and evening peak periods in an adopted Regional Transportation Plan.This data set was developed using several data sources that include Planned Transit Systems identified in the Plan Bay Area 2040 Regional Transportation Plan, Existing Transit locations extracted from the 511 Regional Transit Database, and manual editing conducted by the Spatial Modeling team at the Metropolitan Transportation Commission. The corridor features represent a half-mile buffer around the transit routes that meet the above conditions. Note that the corridor alignments were developed using the best available data or, when necessary, by identifying the shortest route between two consecutive stops on that service.

Assembly Bill 2553(2024) is changing the definition of a bus major transit stop to be the intersection of two corridors with a service interval (headway) of every 20 minutes (3 trips/hr), instead of every 15 minutes (4 trips/hr). Although the bill formally takes effect January 1, 2025, this data set now incorporates this change.This means that there are now two frequency standards captured by this data set:4 trips/hr (15min headway) for high quality transit corridors, as well as bus rapid transit (BRT) major stops (along with other requirements for BRT)3 trips/hr (20min headway) for bus corridors intersecting to form a bus major stopWith this change, bus major stops are no longer a subset of high quality transit corridors, since the intersection of two corridors with frequencies of 3 trips/hr now creates a major stop despite neither being a high quality transit corridor.For information on how Caltrans developed the source data, and to access the complete data set, please visit the High Quality Transit Areas Analysis Open Data Portal.

As defined by SB 375, this is a corridor with fixed route bus service with service intervals no longer than 15 minutes during peak commute hours in the MTP/SCS.

High Frequency Transit Areas (HFTAs) are areas of the region within one-half mile of a major transit stop (existing or planned light rail, streetcar, or train station) or an existing or planned high-quality transit corridor included in the MTP/SCS. A high-quality transit corridor is a corridor with fixed route bus service with service intervals no longer than 15 minutes during peak commute hours. SACOG uses this definition of HFTAs because it coincides with the definition of Transit Priority Projects in SB 375. Under SB 375, Transit Priority Projects are eligible for streamlined environmental review.

Livable Corridors are areas where local jurisdictions may plan and zone for increased density at nodes along key corridors, and to “redevelop” single-story under-performing retail with well-designed, higher density housing and employment centers. Growth at strategic nodes along key corridors, many of which are within High Quality Transit Corridors (HQTCs), will make transit a more convenient and viable option. The Livable Corridors network is developed utilizing select variables from past regional plans like HQTCs and input from local jurisdictions during LDX. Additionally, this strategy is comprised of two components that will encourage context sensitive density, improve retail performance, combat disinvestment, and improve fiscal outcomes for local communities:• Transit Improvements: Some corridors have been identified as candidates for on-street, dedicated lanes or other enhancements (e.g., Transit Signal Priority). Other corridors have the potential to support features that improve the user experience and bus performance, including enhanced bus shelters, real-time travel information, off-bus ticketing, all-door boarding, and longer distances between stops to increase speeds.• Active Transportation Improvements: Increased investments in Complete Streets within Livable Corridors and intersecting arterials are essential to support safe bicycling, walking, and rolling. Investments may include protected lanes to encourage safe bicycling and lower speed mobility, improved pedestrian access, and bicycle and micromobility parking.

This dataset contains locations that meet location eligibility criteria for locally-adopted Infill Opportunity Zones in the nine-county San Francisco Bay Area as defined in the California Government Code, Section 65088.1(e):

Within ½ mile of a Major Transit stop, defined as any of the following: Existing rail stationsPlanned rail stations in an adopted RTP*Existing ferry terminals with bus or rail servicePlanned ferry terminals with bus or rail service in an adopted RTP*Intersection of at least two existing or planned bus routes with headways of 15 minutes or less during both the morning and evening peak periods; or

Within a ½ mile of a High-Quality transit corridor, defined as an existing or planned fixed-route bus corridor with headway of 15 minutes or less during both the morning and evening peak periods*Plan Bay Area 2040

The data set was developed using several data sources that include Planned Transit Systems identified in the Plan Bay Area 2040 Regional Transportation Plan, Existing Transit locations extracted from the 511 Regional Transit Database, and manual editing conducted by the Spatial Modeling team at MTC.

Priority Equity Communities are census tracts in the SCAG region that have a greater concentration of populations that have been historically marginalized and are susceptible to inequitable outcomes based on several socioeconomic factors. The socioeconomic factors, or priority populations, were selected based on statutorily protected populations and refined with input gathered through outreach processes. The US Census Bureau 2017-2021 American Community Survey 5-Year estimates are used to define each of the thresholds for the priority populations. SCAG’s 2022 High Quality Transit Corridors are used in the Limited Vehicle and Transit Access criteria. This dataset uses 2020 census tracts in the SCAG region. A census tract is considered a Priority Equity Community if there is a concentration above the county average of:• BOTH low-income households and people of color; OR• EITHER low-income households or people of color AND of four or more of the following:• Vulnerable Ages • People with Disabilities• People with Limited English Proficiency• Limited Vehicle and Transit Access • People without a High School Diploma• Single Parent Households• Housing Cost Burdened HouseholdsSCAG prepared the dataset by calculating county-level averages for each criterion and removing census tracts that did not meet the criteria. For more details on the methodology or to request the detailed dataset, please contact environmentaljustice@scag.ca.gov.