AirSage Real-Time Traffic (ART™)
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API & Specifications
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AirSage provides real-time traffic data to state and local governments, navigation companies and some large corporations. It has the largest live, real-time traffic coverage area in the country because it is the only company with a nationwide wireless carrier partner. In fact, AirSage collects and analyzes real-time cell phone signals that produce more than three billion anonymous locations every day.
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The ART XML data feed provides traffic data to registered application clients on a 24/7 basis. Clients submit HTTP requests to a URL that contains the unique customer identifier and the desired geographical region (customer data set). The ART XML data feed returns a standard HTTP response with the data. The XML data feed provides traffic data that is compatible with the Alert-C protocol.
The ART XML data feed provides traffic data as a continuous data stream or it can power an online traffic map template (that can be customized for specific areas).
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XML Feed Fields
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Specifically, the ART XML data feed will return the following data fields:
• Data Set ID
• Timestamp
• Location ID
• TMC
• Speed
• Mode
• Travel Time
• Alert_C
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XML Feed Field Descriptions
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This section describes the fields that appear in XML responses from the ART XML data feed:
Timestamp – the universal time code (UTC) for which the data is produced, using the format yyyy-MM-ddThh:mm:ssZ. For example, 2006-06-30T15:23:47Z.
Location ID – an internal identifier that is not intended for integration efforts. Developers should ignore this field.
TMC – indicates the TMC code value for the given TMC code in a 9-digit RDS-TMC format. In TMC, locations are identified by location codes that are stored in pre-defined, separate location tables. ART XML uses TeleAtlas® MultiNet® version 2008.05 and TMC version 3.3 for the location table. The 9-digit TMC code ABBCDDDDD has the following characteristics:
A: Country code (USA=1).
BB: Location Table Number.
C: Direction (opposite to Alert-C direction).
DDDDD: Primary Location Code, defined in the TMC Location Table.
Example: TMC code 110-04143 is equivalent to Alert-C location code generated with the information show below:
{country=1, table=1-, direction= +, primary location=04143, extent=1}
Speed – the average traffic speed on the specified segment in MPH at the time indicated by the Timestamp.
Mode – an indication of confidence or the quality of the traffic data.
Mode is set based on the quantity and quality of the data AirSage processes off of the wireless carrier network.
Travel Time – the time in seconds to travel from starting location to ending location within a segment at the time indicated by Timestamp.
Alert-C: Contains the information needed to build the Alert-C location referencing for RDS-TMC. This field is built according to the location coding defined in the ALERT-C traffic message coding protocol (ISO 14819-3). Segments are generated between pairs of consecutive Points Locations in a Linear Location according to the TMC Location Table, generating EXTENT = 1 segments (the highest resolution segments given in a Location Table).
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