Where does Google Maps get its traffic data from?

Discussion in 'iPhone' started by danpass, Jun 30, 2010.

  1. danpass macrumors 68020

    danpass

    Joined:
    Jun 27, 2009
    Location:
    Miami, FL
    #1
    I've found it to be fairly accurate and was curious.
     
  2. TEG macrumors 604

    TEG

    Joined:
    Jan 21, 2002
    Location:
    Langley, Washington
    #2
    State DOTs (or other Transportation Departments) usually have websites with local road information, developed by cameras and ground loops in the pavement. Google, simply accesses that information and imbeds it into their maps.

    TEG
     
  3. muncheroo macrumors newbie

    Joined:
    Jun 29, 2010
    #3
    can you cite your source for that information?
     
  4. uiop. macrumors 68020

    uiop.

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    Jul 22, 2008
    Location:
    Grand Rapids, MI
    #4
    Its general knowledge...but its true.
     
  5. Rodimus Prime macrumors G4

    Rodimus Prime

    Joined:
    Oct 9, 2006
    #6
    generally they pull if from state DOT. now the states get this information based on toll tags.

    States have a few check points that scan people toll tags and they use than figure out how long it takes to get to the next point and compute the speed based off that.
    Now they do not store the numbers or even link them back up to the owner. All the car about are like the last 5-7 digits for their sample group.

    That is why some places have it and other do not because if there is no toll tag system around the area their is no way to pull a sample group.
     
  6. ruinfx macrumors 6502a

    Joined:
    Feb 20, 2008
  7. danpass thread starter macrumors 68020

    danpass

    Joined:
    Jun 27, 2009
    Location:
    Miami, FL
    #8

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