meant to be true amateurs, these criteria are tighter than that seen in GT3. Drivers under the age of 30 are not allowed to have had a top-ten finish in any national or international single-seater championship, nor to have had a distinguishable career in a national or international GT championship. These drivers are known as Silver drivers. Drivers over the age of 30 who did not receive their racing licenses until after turning 30 and having no single-seater experience at all are also allowed in the series, under the term Bronze drivers. Races Just as in GT3, each event would consist of two races of equal distance, usually held on different days. Teams were not required to have two drivers and could use the same driver for each race. Championship The championship used the standard FIA point scheme for the top ten finishers: 25-18-15-12-10-8-6-4-2-1. If a team used different drivers for each race in a single event, both drivers would receive points. A driver and team championship were both held. If at least five cars of the same make participate in a race, then a manufacturer cup would also be awarded, similar to the style used in GT3. Champions Drivers Teams Similar series Since the introduction of the GT4 European Cup, the GT4 class of cars have been expanded to various national series. The British GT Championship and Belgian GT Championship allow GT4 and Super Sport class cars to compete alongside the GT3 class, while the stand-alone Dutch GT4 Championship ran its first season of competition 2009. The Spanish GT Cup Open Europe series also allows GT4 cars to compete with one-make cars. A GT4 championship plans to be run in Brazil in 2010. Norway introduced a national championship called GTF in 2014 featuring GT4 regulated cars. The Super Taikyu Series in Japan also includes a GT4 class called ST-Z. The United States-based ACCUS offers the GT4 America Series promoted by SRO and sanctioned by the United States Auto Club for one-hour sprint races, and the Michelin Pilot Challenge sanctioned by the International Motor Sports Association for longer races (2-4 hours). References External links Dutch GT4 Championship GT4 (sports car class) Sports car racing series Recurring sporting events established in 2007