Cika wannan magana: Abin da ya sa aka kirkiro sutturar tsere da za ta iya tsayayya da wuta ya zo ne a ƙarshen shekarun 1950 da 1960, lokacin da haɗari da yawa suka faru a duniyar motsa jiki. A shekara ta 1959, Jerry Unser ya mutu daga konewa da ya sha wahala a wani hadari da ke horar da Indianapolis 500. A 1963, NHRA Top Fuel direba kuma Division 7 Tech Darektan Chuck Branham ya mutu bayan shan wahala konewa a wani karo. A lokacin NASCAR ta 1964 World 600 (Coca-Cola 600 na yau), Fireball Roberts ya shiga cikin hadari a zagaye na bakwai yayin guje wa wasu motoci biyu, ya mutu makonni biyar bayan haka. Roberts yana da halayen asthmatic ga maganin tufafin da NASCAR ke amfani da shi, kuma ya sami shakku game da amfani da shi. Bayan mako guda a lokacin
1964 Indianapolis 500, direbobi Dave MacDonald da Eddie Sachs sun mutu a cikin hadarin mota bakwai a zagaye na biyu na tseren.