These issues affect Truck analyses with Network Performance for data months in 2026 as of the 2604 release. We are working on resolving these issues in the upcoming release.

For 2026 data months in Network Performance with the Truck travel mode, in the day_types parameter, you must define weekdays as Monday - Friday Weekday|15, while for other data months, you must define weekdays as Monday - Thursday Weekday|14.

No data returned for 2026 with Mon - Thu weekdays

Network Performance analyses using Truck mode and 2026 date ranges will return empty results if a Monday - Thursday weekday definition is used. This occurs with the following parameter settings:

• analysis_type = "Network_Performance"
• travel_mode_type = "Truck"
• date_ranges include 2026
• day_types include Weekday|14

Workaround

For Network Performance Truck analyses with 2026 date ranges, specify day_types = "Weekday|15 instead of the default day_types = "Weekday|14.

Mixing 2026 with earlier years in date_ranges

The API allows combining 2026 with earlier years in a single request, but results may be inconsistent due to different weekday definitions, and the issue described above.

Workaround

• Use day_types = "Weekday|15" for 2026 analyses
• Run separate requests for 2026 vs. earlier years
• Use caution when comparing results across years due to differing weekday definitions

AGPS data model update

The agps data source now uses an upgraded model to calculate volume for all data beginning in January 2023 and onward. This new model delivers improved coverage, with volumes provided on most low-volume roads, such as residential roads, for All Day Types and Day Parts.

Additionally, you can get prediction intervals for volumes only when you include All Day Parts and All Day Types.

This model will be used going forward for all new data releases. Data for December 2022 and previous will use the previous model.

Endpoints and authentication remain the same; only the data model and coverage are updated.

• For metrics requests with the agps source, osm_vintage is now a required argument for the field parameter.
• Fixed a bug where the API incorrectly labeled day_type in the metrics CSV. Now the day_type in the metrics will align with the day you request, where 1 is Sunday and 7 is Saturday.

AGPS data model update

The agps data source now uses an upgraded model to calculate volume for all data beginning in 2019 and onward. This new model delivers:

• Enhanced performance, particularly on low-volume roadways
• Improved differentiation between weekday and weekend traffic trends
• More stable historical comparisons

This model will be used going forward for all new data releases.

New OSM Vintage parameter

Queries using the agps data source must now specify the OpenStreetMap (OSM) vintage. The selected vintage determines the road network geometry used to calculate metrics. You can specify the osm_vintage parameter for the Segment Count, Geometry, and Metrics endpoints. The following vintages are available:

• 202302: OSM snapshot from February 2023, use for dates through December 2024
• 202501: OSM snapshot from January 2025, use for dates from January 2025 onward

For more information, see Defining Geometry.

New geometry fields

You can now define geographies with the following new fields:

• taz_id: 2020 Traffic Analysis Zone (TAZ) ID
• places_2020: 2020 Census FIPS Place ID

For more information, see Defining Geometry.

You can now get trip purpose metrics for the All Vehicles CVD+ travel mode. To get this metric, do the following in your Create and run an analysis request:

1. Set analysis_type to Zone_Activity_Analysis, OD_Analysis, OD_MF_Analysis, or OD_Preset_Geography.
2. Set travel_mode_type to All_Vehicles_CVD_Plus.
3. Enable the traveler_attributes parameter.

For more information in the StreetLight Help Center, see Traveler Attributes.

You can now analyze zone sets made up of GeoJSON LineStrings with the Network Performance analysis type. Previously, you could only analyze zone sets made up of OSM IDs.

You can now analyze Truck volume for 2023 with the Network Performance analysis type. Configure the following parameters for the Create and run an analysis endpoint:

"analysis_type": "Network_Performance",
"travel_mode_type": "Truck",
"output_type": "volume"

New data months are available for Canadian geographies for 2023. For details on metrics you can get, see Available Metrics.

You can now analyze the Truck travel mode with the Network_Performance analysis type.

Monthly and annual metrics for 2019 and 2020, as well as June through July 2024 are now available for the AGPS data source. To get these metrics, set the source parameter to AGPS when making a request to the Metrics endpoint.