Vehicle signage for Group N cars is as follows:
The location and size of competition numbers shall be an upper case “N” directly followed by a lower case “a”, “b” or “c” (as appropriate) being black or white contrasting in colour to that of the bodywork, 100mm and 80mm in height respectively in typeset Helvetica Bold Condensed immediately following the vehicle’s racing number at the bottom right hand corner, no further than 100mm from the border of the background. See the rule at this link.
All 5th Category vehicles which have a disc or rectangular background to the competition number may carry either black numbers on a white background or white numbers on a black background. See the rule at this link.
Group N vehicles may use a windscreen competition number. The number must be white, bold sans serif condensed (Helvetica Bold Condensed, Zurich Bold Condensed or Arial Narrow Bold) and 100mm high. And should be located no more than 120mm from the top of the windscreen to the top of the number on the passenger side of the front windscreen. See the rule at this link.
Competitor and/or Driver Name
No advertising material or sign will be distributed from or carried on any vehicle in this category provided that this rule shall not apply to the manufacturer’s usual nameplate. Motorsport Australia reserves the right to permit also the display – in neat, unobtrusive lettering – of the name of the competitor and/or the driver and/ or the State of their residence on the scuttle or the side of the vehicle.
The “Competitor” is the entrant or the car owner. In Historic racing the entrant must also be the owner of the car as shown in the logbook. Therefore the “competitor” is the owner of the car.
The “Driver” is the person driving the vehicle at each particular event the vehicle has been entered.
The total area of all such signs shall not exceed 75mm in height and 600mm in length on each side of the vehicle”. See the rule at this link.
Territory of Origin
The territory of origin of the driver may be shown on the vehicle. Each sign must be not larger than 100mm by 150mm and must be placed below the window line. Only two such signs are permitted. See the rule at this link.
Club badges of an acceptable motoring club may appear on the vehicle. Each badge must be not larger than 150mm by 100mm and must be placed below the window line. Only two such badges are permitted, one on each side. See the rule at this link.
The location of the battery must be indicated by a blue triangle (with sides of 150mm) on the coachwork. See the rule at this link.