Found on another forum.
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The French are ahead of us in this and many other aspects of their respect for cyclists. This page summarises those parts of the French highway code that refer to cyclists:
http://velobuc.free.fr/coderoutecycliste.html
It includes this:
' • la distance latérale de sécurité passe à 1,50m hors agglomération * (1m en agglomération) Art.4'
(The safe distance for vehicles passing cycles is 1 m in built-up areas and 1.5 metres elsewhere).
This is a required minimum, not an average.
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Don't know if "required minimum" has any legal significance.