The first edition of Human Transit, published in 2011, has become a classic for professionals, advocates, and interested citizens. Walker has updated and expanded the book to deepen its explanations. New topics include the problem with specialization, the role of flexible or "demand response" services, how to know when to redesign your network, and responding to tech-industry claims that transit will soon be obsolete. Finally, he has also added a major new section exploring the idea of access to opportunity as a core measure of transit's success. No other book explains the basic principles of public transit in such lively and accessible prose, all based on a respect for your right to form your own opinion. Walker's goal is not to make you share his values, but to give you the tools to clarify and advocate for yours.