| Clue | Race (circuit) | more info |
|---|
| The works Alfa team was prevented from racing in this national Grand Prix on Mussolini's orders. | |
| The British teams (mainly Lotus, Cooper and BRM) boycotted this race due to safety concerns about the circuit. | |
| Arguements rage over non-paid driver fines. Ferrari, Alfa Romeo and Renault withdraw from FOCA organised event. Race loses championship status. | |
| Late attempts to change this race's date cause problems. Loses championship status and non British teams do not attend. Sliding skirts are allowed despite being banned. | |
| Only 14 cars start after other teams withraw to protest the FISA ban on topping up water cooled brake tanks post race. | |
| Zakspeed, Renault and Ligier boycott this race due to the host nations political regime. | |
| Andrea Moda are forced to withdraw when a truckers strike and road blockades in the host nation prevent them getting to the circuit. | |
| Sauber withdraw after qualifying due to several wing failures. | |
| Only six cars start after the other teams withdraw due to tyre safety concerns. | |
| Renault were orignally banned from this race due events of the previous years Singapore Grand Prix. The ban was overturned on appeal and Renault did compete. | |
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