Neat, crisp informative book by Antoine Picon in the AD Primer Series. Gives myself, James Cheshire and Joan Serras a mention too on transit in London and the science of cities but the book is valuable as a quick but meaty introduction to the domain with some nice graphics. You can in fact download an earlier version of the book as a PDF as the French Edition – a quick comparison shows that the English Version is an update of the French but if you are prepared to read the French click here. You will have to buy the English one but in any event it is an interesting summary.