The 16 combined events made for one of the most gruelling and varied championships in the history of motor racing. Some events, notably Le Mans and Daytona featured prototype sports cars. Others like the second shorter Daytona race and the Spa 24 Hour were touring car events with the rest consisting mostly of Grand Touring sportscars. Some of the European races featured Sports 2000 open bodied sports cars, but nothing larger than two litres engine capacity. No single driver started more than ten of the 16 races, with the Monza 1000 and the Riverside 5 Hour both occurring on the same day (and strangely both events counting towards the drivers title) no driver could attempt all 16. With over 1100 drivers competing it was one of the largest entries in the history of the sport.