I have been reading "Bike battles" by James Longhurst of the University of Wisconsin. The book is a review of the history of cycling in the United Stastes, with particular emphasis on the cultural and legal aspects of how bicycles have been granted (or not) access to public roadways.
I may have more to say about this interesting book later. However, a passage on telegraph boys in the early 20th century struck me (pp. 112ff).