Autodesk Vehicle Tracking allows you to define a default vehicle, which will be used every time you start to drive unless you actively select an alternative. This can be very useful if you regularly use the same vehicle. If you select a vehicle to drive and you do not have a default vehicle set, the Default Vehicle dialog will appear.
If you select Yes then this vehicle will be selected automatically next time you use any drive command. If you select No then you will be asked about the default the next time you select a vehicle in similar circumstances. If you don’t want to be asked again, select Don’t Ask Me This Again.