In the push for new vehicle designs, the distinctions between vehicle
classes are quickly becoming blurred. We use shape grammars to quantify
the differences between vehicle classes through the application of
class-specific rules and the constraint of rule applications to within
parametric ranges determined for each class. This allows for the
development of new vehicle forms that clearly fall within a class or
purposefully cross over the boundaries of classes and mix rules and ranges
to create unique and interesting cross-over vehicles.