ScanToTrackAuto:

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   Initializes a new track for an automobile from radar measurements.

   The new state estimate is [x;y;vX;vY]. It is derived from the
   radar measurement by directly computing x and y and assuming that
   the range rate is entirely along x. x is the direction along the
   highway.
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   Form:
   trk = ScanToTrackAuto( xMeas, d, scan0, treeID, tag )
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   ------
   Inputs
   ------
   xMeas	  (1,1)   Position measurement data
   d       (1,1)   Data structure
                    .x      (6,1) State of tracking car
                    .filter	(1,1) Filter data structure
   scan0	  (1,1)   Scan number at which this track is created
   treeID	(1,1)   Track-tree ID. The track is inside this tree.
   tag     (1,1)   Unique tag to distinguish from all other tracks
   
   -------
   Outputs
   -------
   trk     (1,1)   Track data structure

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   See also MHTInitializeTrk.
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Children:

MHT: TrackInitialization/MHTInitializeTrk