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.

• AADT analyses now use the oz_sets to define a zone set; the az_sets parameter has been removed.
• AADT analyses must now set travel_mode_type to All_Vehicles_AGPS
• Data months are now available in the Network Performance analysis type for Canadian accounts.

With the Network Performance analysis type, you can now select to get spot metrics or segment metrics. For more information, see Setting up Nework Performance analyses.

Aggregated GPS data source

New data source for U.S. geographies: Aggregated GPS data. This allows you to analyze the most recent data months. To use this new data source, set the source parameter in your Metrics request to AGPS.

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The source parameter defaults to lbs_plus. You only need to specify the source parameter if you want to analyze the data months above; you do not need to edit your existing requests unless you want to use the new Aggregated GPS data source.

To check the latest data months available for the Aggregated GPS data source, use the Date Ranges endpoint.

The Aggregated GPS data source also allows you to analyze the following new metrics:

• free_flow_factor
• free_flow_speed
• speed_percentiles
• speed_count
• seg_travel_time_secs
• max_1hr_speed

For more information, see Available Metrics.

Data months for Canada

New data months are available for Canadian geographies for January 2019 through April 2022. For details on metrics you can get, see Available Metrics.