In NZ we have rule books for road racing and other classes, it's about the style of bike rather than venues. Seagrove did some racing on the airstrip and some including the NZTT on a combination of the airfield and the roads at the facility. In my book New Zealand Motorcycle Road Racing Circuits I covered Airfeild, closed circuits, street circuits (like cemetery circuits 1 mile downtown) and road races, like pateas 10 mile 16 km circuit. I've covered 160 venues inc variations of them in nz, for the airfield ones i only covered one version at each venue, as the layout was often a fixed route yet corners varied due to traffic cone placemnet on wide open spaces effectively giving them endless options. hope that claifies things?