BBC Sport - Spectator strolls on track during 2015 Singapore Grand Prix

Spectator strolls on Singapore circuit

A spectator goes for a stroll along the track in the middle of the Singapore Grand Prix.

Race leader Sebastian Vettel is the first to encounter the spectator, exclaiming "there's a fan on the track!" on his team radio.

Vettel went on to take his third win of the year in dominant style, controlling the race from start to finish.

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