"Fans should not be on when moving they should only come on when there is insufficent airflow" is what I said, they should NOT be on at any other time, even with the standard huge span I do not find mine a problem and the only time they activate is when stationary and then for a couple of minutes maximum, never have mine stayed on for a mile!

Given if they have just come on and you then move off they will obviously still be on.

Martin