Google has added ‘bicycling’ as a method of transport for the Google Maps ‘directions’ feature. It joins the existing, walking, by car and by public transport options as a fourth alternative method of transport.
The only difference I can see that a ‘cycle route’ offers to walking is the estimated time, I am unsure how well mapped out, even if there are any routes designed JUST for a bike.
The feature is still only available for the US map but expect it to be rolled out worldwide in the nest few weeks and months.