The NACTO Urban Bikeway Design Guide, Second Edition is based on the experience of the best cycling cities in the world. The designs in this book were developed by cities for cities, since unique urban streets require innovative solutions. To create the Guide, the authors conducted an extensive worldwide literature search from design guidelines and real-life experience. They worked closely with a panel of urban cycleway planning professionals from NACTO member cities and from numerous other cities worldwide, as well as traffic engineers, planners, and academics with deep experience in urban cycleway applications. The Guide offers substantive guidance for cities seeking to improve bicycle transportation in places where competing demands for the use of the right of way present unique challenges. Each of the treatments addressed in the Guide offers three levels of guidance: Required: elements for which there is a strong consensus that the treatment cannot be implemented without; Recommended: elements for which there is a strong consensus of added value; and, Optional: elements that vary across cities and may add value depending on the situation. First and foremost, the NACTO Urban Bikeway Design Guide, Second Edition will help practitioners make good decisions about urban cycleway design. The treatments outlined in the Guide are based on real-life experience in the world's most bicycle friendly cities and have been selected because of their utility in helping cities meet their goals related to bicycle transportation. The Guide is an indispensable tool every planner must have for their daily transportation design work.