Use the 1 Drawing Unit Represents field to specify a fixed drawing scale in metric or imperial units.
The Auto Check Scale Against Window Size setting causes Autodesk Vehicle Tracking to perform a crude scale check on existing drawings the first time an object is placed in a new drawing. This is a useful reminder if you have not set the drawing units and/or scale correctly.
The Prompt For Scale On First Use setting causes Vehicle Tracking to prompt you for a scale on new drawings. Note that this box is ticked by default for Novice users.
The Angles section contains values that are read from your CAD system settings and cannot be edited here. If you need to change these settings, do so through your CAD system.
The Driving Convention setting determines the position of a driver or pilot, if defined, and therefore Vehicle Tracking if the tracking point is set to pilot/driver. It also affects the direction of angled parking bays according to the direction of traffic flow if you are using the parking tools.