Saturday morning practice at the Indian Grand Prix has been delayed, initially by 15 minutes, then extended to half an hour, as the ever-present 'fog' prevents the medical helicopter from being activated.

The Buddh International Circuit always appears to be wreathed in a smoky mist, generally attributed to the level of local air pollution, but conditions on Saturday morning were worse than usual, and, with the nearest major hospital outside of the mandated travelling time by road, the helicopter becomes an essential part of the infrastructure.

The decision to hold up the session came as a surprise to the teams, which were all ready to send their drivers out for the final 60 minutes of preparation ahead of qualifying for Sunday's race. The session will now be shortened accordingly - provided there is no further delay - as there has to be a minimum time gap between FP3 and qualifying.

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MotoGP has also suffered visibility delays this weekend - albeit due to rain and fog at Motegi, Japan.