Up until the mid-70s, when F1 drivers weren't driving their cars in Grands Prix or non-championship races, it was common for them to spend their free weekends driving various other machinery including F2, Sports Cars, Touring Cars or whatever else was available for racing. However, as F1 began to grow in popularity and the sport, teams and sponsors became more precious about the brand, drivers found their contracts were suddenly preventing them from competing in other series. Of course, the situation was not helped by the fact that a number of legendary F1 drivers were killed whilst racing in other disciplines, most notably Jim Clark who was killed in an F2 race at Hockenheim in 1968. Last...
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