What's the distance of the bikeshed?

Mobility shed diagram
Originally uploaded by rllayman

At a talk today, Chris Leinberger, author of the newly published book The OPTION OF URBANISM: Investing in a New American Dream mentioned that the distance the typical person is willing to walk is 1,500 to 3,000 feet. I find that in nicer places to walk, people seem to be willing to walk up to one mile (5,280 feet). Afterwards, talking to Neal Pearce, the syndicated columnist, he groused about bicycling, opining that few people likely biked to the session, and we speculated about the "bikeshed."

I figure a typical bicyclist is willing to bike work-shopping-visit (non-leisure/recreation bicycling) trips up to 5 to 7-8 miles in length as a matter of course.

What do you think?