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.
Permitted – 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 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.