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Particular concerns have been raised over the July 30 cross-country competition, which is part of the three-day event.
Fifty thousand tickets have been issued.
Hendy urged Olympic organisers to ponder how issuing further tickets for the event - it could reportedly accommodate up to 75,000 people - might affect congestion on London's transport network.
A spokesman for the Games organising committee said final ticket numbers for the event will be based around crowd modelling and transport assessments.