Autodesk Vehicle Tracking data is stored in the host CAD drawing allowing you a number of benefits.
However, as you use Autodesk Vehicle Tracking, the host system frequently needs to make temporary copies of data. Most of these copies may be removed but, depending upon how your CAD system is configured, they often are not.
Luckily there are ways that you can recover the space taken by the working data.
Removing Space in AutoCAD Drawings
By default AutoCAD does an incremental save of the drawing using QSAVE. This does not remove all deleted and temporary objects.
Use PURGE to remove all unused objects or SAVEAS to perform a full save and remove superseded data.
Removing Space in MicroStation drawings
Use COMPRESS DESIGN to remove superseded AutoTrack data.