This service 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 Maps API to support clickable flow data visualizations.
• With this API, the client side can connect any place in the map with flow data on the closest road and present it to the user.

You can easily run this and other endpoints.

1. Go to the TomTom API Explorer page.
2. Click an endpoint.
   1. Click Try it out.
   2. Enter/select all required parameter values and any optional parameter values.
   3. At the bottom of the form, click Execute.
3. Review the Response.

HTTPS method: GET

URL format

For ease of viewing and identification:

• Required constants and parameters are shown in bold text.
• Optional parameters are shown in plain text.

http(s)://baseURL/traffic/services/versionNumber/flowSegmentData/style/zoom/format?key=Your_API_Key&point=point&unit=unit&thickness=thickness&openLr=boolean&jsonp=jsonp

Example

https://api.tomtom.com/traffic/services/4/flowSegmentData/absolute/10/xml?key=Your_API_Key&point=52.41072,4.84239

curl command

curl -XGET 'https://api.tomtom.com/traffic/services/4/flowSegmentData/absolute/10/xml?key=Your_API_Key&point=52.41072,4.84239'

Request parameters

The following table describes the parameters that can be used in a Request.

• Required parameters must be used or the call will fail.
• Parameters and values are case-sensitive.
• Optional parameters may be used.
• If there is a default value that will be assumed when an optional parameter is not used, it is shown in the table.

Types of traffic flow

Referring to the style parameter, there are various types of traffic flow to use.

• absolute: This reflects the absolute speed.
• relative: This is speed relative to free flow, highlighting areas of congestion.
• relative-delay: These are relative speed values different from the ones for the free-flow. Only highlights areas of congestion.

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HTTP Request headers

The following data table lists HTTP Request headers of particular interest to clients of the Flow Segment Data API endpoint.

XML Response body

An XSD schema is available for download. The XML Response of the preceding sample Request would look like this:

<flowSegmentData xmlns="http://lbs.tomtom.com/services" version="traffic-service 2.0.004">
    <frc>FRC2</frc>
    <currentSpeed>41</currentSpeed>
    <freeFlowSpeed>70</freeFlowSpeed>
    <currentTravelTime>153</currentTravelTime>
    <freeFlowTravelTime>90</freeFlowTravelTime>
    <confidence>0.59</confidence>
    <coordinates>
        <coordinate>
            <latitude>52.40476</latitude>
            <longitude>4.844318</longitude>
        </coordinate>
        <coordinate>
            <latitude>52.411312</latitude>
            <longitude>4.8299975</longitude>
        </coordinate>
        <coordinate>
            <latitude>52.415073</latitude>
            <longitude>4.827327</longitude>
        </coordinate>
    </coordinates>
</flowSegmentData>

JSON Response body

{
  "flowSegmentData": {
    "-xmlns": "http://lbs.tomtom.com/services",
    "-version": "traffic-service 2.0.004",
    "frc": "FRC2",
    "currentSpeed": "41",
    "freeFlowSpeed": "70",
    "currentTravelTime": "153",
    "freeFlowTravelTime": "90",
    "confidence": "0.59",
    "coordinates": {
      "coordinate": [
        {
          "latitude":  52.40476,
          "longitude": 4.844318
        },
        {
          "latitude":  52.411312,
          "longitude": 4.8299975
        },
        {
          "latitude":  52.415073,
          "longitude": 4.827327
        }
      ]
    }
  }
}

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Response field structure

The following table describes XML or JSON element fields that can appear in a Response. The types of the fields refer to a JSON Response.

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HTTP Response codes

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HTTP Response headers

The following data table lists HTTP Response headers of particular interest to clients of the Flow Segment Data API endpoint.