Traffic - Get Traffic Flow Segment

Reference

Service:: Maps

API Version:: 1.0

Use to get information about the speeds and travel times of the specified section of road.

The Traffic Flow Segment API is an HTTP GET request that provides information about the speeds and travel times of the road fragment closest to the given coordinates. It is designed to work alongside the Flow layer of the Render Service to support clickable flow data visualizations. With the Traffic Flow Segment API, the client side can connect any place in the map with flow data on the closest road and present it to the user.

GET https://atlas.microsoft.com/traffic/flow/segment/{format}?api-version=1.0&style={style}&zoom={zoom}&query={query}

With optional parameters:

GET https://atlas.microsoft.com/traffic/flow/segment/{format}?api-version=1.0&style={style}&zoom={zoom}&query={query}&unit={unit}&thickness={thickness}&openLr={openLr}

URI Parameters

Name	In	Required	Type	Description
format	path	True	ResponseFormat	Desired format of the response. Value can be either json or xml.
api-version	query	True	string	Version number of Azure Maps API.
query	query	True	number[]	Coordinates of the point close to the road segment. This parameter is a list of four coordinates, containing two coordinate pairs (lat, long, lat, long), and calculated using EPSG4326 projection. When this endpoint is called directly, coordinates are passed in as a single string containing four coordinates, separated by commas.
style	query	True	TrafficFlowSegmentStyle	The style to be used to render the tile. Valid values are absolute which returns colors reflecting the absolute speed measured, relative which returns the speed relative to free-flow, Relative-delay which displays relative speeds only where they are different from the freeflow speeds
zoom	query	True	integer int32	Zoom level for the desired tile. Zoom value must be in the range: 0-22 (inclusive). Please see Zoom Levels and Tile Grid for details.
openLr	query		boolean	Boolean on whether the response should include OpenLR code
thickness	query		integer int32	The value of the width of the line representing traffic. This value is a multiplier and the accepted values range from 1 - 20. The default value is 10.
unit	query		SpeedUnit	Unit of speed in KMPH or MPH

Request Header

Name	Required	Type	Description
x-ms-client-id		string	Specifies which account is intended for usage in conjunction with the Microsoft Entra ID security model. It represents a unique ID for the Azure Maps account and can be retrieved from the Azure Maps management plane Account API. To use Microsoft Entra ID security in Azure Maps see the following articles for guidance.

Responses

Name	Type	Description
200 OK	TrafficFlowSegmentData	OK
Other Status Codes	ErrorResponse	An unexpected error occurred.

Security

AADToken

These are the Microsoft Entra OAuth 2.0 Flows. When paired with Azure role-based access control it can be used to control access to Azure Maps REST APIs. Azure role-based access controls are used to designate access to one or more Azure Maps resource account or sub-resources. Any user, group, or service principal can be granted access via a built-in role or a custom role composed of one or more permissions to Azure Maps REST APIs.

To implement scenarios, we recommend viewing authentication concepts. In summary, this security definition provides a solution for modeling application(s) via objects capable of access control on specific APIs and scopes.

Notes

This security definition requires the use of the x-ms-client-id header to indicate which Azure Maps resource the application is requesting access to. This can be acquired from the Maps management API.

The Authorization URL is specific to the Azure public cloud instance. Sovereign clouds have unique Authorization URLs and Microsoft Entra ID configurations. * The Azure role-based access control is configured from the Azure management plane via Azure portal, PowerShell, CLI, Azure SDKs, or REST APIs. * Usage of the Azure Maps Web SDK allows for configuration based setup of an application for multiple use cases.

For more information on Microsoft identity platform, see Microsoft identity platform overview.

Type: oauth2
Flow: implicit
Authorization URL: https://login.microsoftonline.com/common/oauth2/authorize

Scopes

Name	Description
https://atlas.microsoft.com/.default	https://atlas.microsoft.com/.default

subscription-key

This is a shared key that is provisioned when you Create an Azure Maps account in the Azure portal or using PowerShell, CLI, Azure SDKs, or REST API.

With this key, any application can access all REST API. In other words, this key can be used as a master key in the account that they are issued in.

For publicly exposed applications, our recommendation is to use the confidential client applications approach to access Azure Maps REST APIs so your key can be securely stored.

Type: apiKey
In: query

SAS Token

This is a shared access signature token is created from the List SAS operation on the Azure Maps resource through the Azure management plane via Azure portal, PowerShell, CLI, Azure SDKs, or REST APIs.

With this token, any application is authorized to access with Azure role-based access controls and fine-grain control to the expiration, rate, and region(s) of use for the particular token. In other words, the SAS Token can be used to allow applications to control access in a more secured way than the shared key.

For publicly exposed applications, our recommendation is to configure a specific list of allowed origins on the Map account resource to limit rendering abuse and regularly renew the SAS Token.

Type: apiKey
In: header

Examples

Request traffic flow segment information

Sample request

HTTP

GET https://atlas.microsoft.com/traffic/flow/segment/json?api-version=1.0&style=absolute&zoom=10&query=52.41072,4.84239

Sample response

Status code:: 200

{
  "flowSegmentData": {
    "frc": "FRC3",
    "currentSpeed": 79,
    "freeFlowSpeed": 79,
    "currentTravelTime": 33,
    "freeFlowTravelTime": 33,
    "confidence": 0.5,
    "coordinates": {
      "coordinate": [
        {
          "latitude": 52.404648,
          "longitude": 4.8442388
        },
        {
          "latitude": 52.408447,
          "longitude": 4.8357286
        }
      ]
    },
    "openlr": null,
    "@version": "1.0.53-mascoma"
  }
}

Definitions

Name	Description
Coordinates	Includes the coordinates describing the shape of the segment. Coordinates are shifted from the road depending on the zoom level to support high quality visualization in every scale.
ErrorAdditionalInfo	The resource management error additional info.
ErrorDetail	The error detail.
ErrorResponse	Error response
FlowSegmentData	Flow Segment Data property
LatLongPair	A location represented as a latitude and longitude.
ResponseFormat	Desired format of the response. Value can be either json or xml.
SpeedUnit	Unit of speed in KMPH or MPH
TrafficFlowSegmentData	This object is returned from a successful Traffic Flow Segment call
TrafficFlowSegmentStyle	The style to be used to render the tile. Valid values are absolute which returns colors reflecting the absolute speed measured, relative which returns the speed relative to free-flow, Relative-delay which displays relative speeds only where they are different from the freeflow speeds

Coordinates

Includes the coordinates describing the shape of the segment. Coordinates are shifted from the road depending on the zoom level to support high quality visualization in every scale.

Name	Type	Description
coordinate	LatLongPair[]	Coordinate array

ErrorAdditionalInfo

The resource management error additional info.

Name	Type	Description
info	object	The additional info.
type	string	The additional info type.

ErrorDetail

The error detail.

Name	Type	Description
additionalInfo	ErrorAdditionalInfo[]	The error additional info.
code	string	The error code.
details	ErrorDetail[]	The error details.
message	string	The error message.
target	string	The error target.

ErrorResponse

Error response

Name	Type	Description
error	ErrorDetail	The error object.

FlowSegmentData

Flow Segment Data property

Name	Type	Description
@version	string	This indicates the software version that generated the response.
confidence	number	The confidence is a measure of the quality of the provided travel time and speed. A value of 1 means full confidence, that the response contains the highest quality data. Lower values indicate the degree that the response may vary from the actual conditions on the road. Any value greater than 0.6 means the information was based on real-time probe input. A value of 0.5 means the reported speed is based on historical info. A value between 0.5 and 0.6 has a calculated weighted average between historical and live speeds.
coordinates	Coordinates	Includes the coordinates describing the shape of the segment. Coordinates are shifted from the road depending on the zoom level to support high quality visualization in every scale.
currentSpeed	integer	The current average speed at the selected point, in the units requested. This is calculated from the currentTravelTime and the length of the selected segment.
currentTravelTime	integer	Current travel time in seconds, across this traffic segment, based on fused real-time measurements between the defined locations in the specified direction.
frc	string	Functional Road Class. This indicates the road type: 0: Motorway, freeway or other major road. 1: Major road, less important than a motorway. 2: Other major road. 3: Secondary road. 4: Local connecting road. 5: Local road of high importance. 6: Local road.
freeFlowSpeed	integer	The free flow speed expected under ideal conditions, expressed in the units requested. This is related to the freeFlowTravelTime.
freeFlowTravelTime	integer	The travel time in seconds, across this traffic segment, which would be expected under ideal free flow conditions.
openlr	string	OpenLR code for segment. See OpenLR for more information on the use of Open LR codes.

LatLongPair

A location represented as a latitude and longitude.

Name	Type	Description
latitude	number	Latitude property
longitude	number	Longitude property

ResponseFormat

Desired format of the response. Value can be either json or xml.

Name	Type	Description
json	string	The JavaScript Object Notation Data Interchange Format
xml	string	The Extensible Markup Language

SpeedUnit

Unit of speed in KMPH or MPH

Name	Type	Description
KMPH	string	Kilometers Per Hour
MPH	string	Miles Per Hour

TrafficFlowSegmentData

This object is returned from a successful Traffic Flow Segment call

Name	Type	Description
flowSegmentData	FlowSegmentData	Flow Segment Data property

TrafficFlowSegmentStyle

The style to be used to render the tile. Valid values are absolute which returns colors reflecting the absolute speed measured, relative which returns the speed relative to free-flow, Relative-delay which displays relative speeds only where they are different from the freeflow speeds

Name	Type	Description
absolute	string
relative	string
relative-delay	string

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