Transit and cities grow together. As cities work to become more compact, sustainable, and healthy, their work is paying dividends: in 2014, Americans took 10.8 billion trips on public transit, the highest since the dawn of the highway era. But most of these trips are on streets that were designed to move private cars, with transit as an afterthought. The NACTO Transit Street Design Guide places transit where it belongs, at the heart of street design. The guide shows how streets of every size can be redesigned to create great transit streets, supporting great neighbourhoods and downtowns. The Transit Street Design Guide is a well-illustrated, detailed introduction to designing streets for high-quality transit, from local buses to BRT, from streetcars to light rail. Drawing on the expertise of a peer network and case studies from across North America, the guide provides a much-needed link between transit planning, transportation engineering, and street design. The Transit Street Design Guide presents a new set of core principles, street typologies, and design strategies that shift the paradigm for streets, from merely accommodating service to actively prioritizing great transit. The book expands on the transit information in the acclaimed Urban Street Design Guide, with sections on comprehensive transit street design, lane design and materials, stations and stops, intersection strategies, and city transit networks. It also details performance measures and outlines how to make the case for great transit street design in cities. The guide is built on simple mathematics: allocating scarce space to transit instead of private automobiles greatly expands the number of people a street can move. Street design and decisions made by cities, from how to time signals to where bus stops are placed, can dramatically change how transit works and how people use it. The Transit Street Design Guide is a vital resource for every transportation planner, public transport operations planner, and city traffic engineer working on making streets that move more people more efficiently and affordably.