The AASHTO Guide for the Development of Bicycle Facilities, Fifth Edition (2024), provides engineering guidance for planning, designing, and operating bicycle infrastructure on streets and highways. Early chapters introduce the guide, discuss bicyclist operation and safety, and cover bicycle planning and the selection of an appropriate bikeway type. Design chapters address elements of design, shared use paths, separated bike lanes and side paths, bicycle boulevards, and shared lanes and bike lanes. Later chapters cover traffic signals and pedestrian hybrid beacons, bicycle facility design at interchanges and alternative intersections, rural bikeways, structures, and wayfinding systems. The guide closes with maintenance and operations and with bicycle parking, bike share siting, and end-of-trip facilities. It is intended for roadway designers, planners, and agency staff developing bicycle facilities.