AASHTO MBI-2, Movable Bridge Manual for Inspection, Evaluation, and Maintenance, Second Edition (2017), provides uniform guidelines for the structural, mechanical, electrical, and operational aspects of movable highway bridges. Part 1 introduces movable bridge types, including bascule, swing-span, and vertical-lift structures, and describes the functional systems that operate them, such as support, balance, drive, control, interlocking, navigation guidance, and traffic control. The same part addresses movable bridge houses, quality measures, and recent industry standards on sustainability, security, and resiliency. Part 2 covers inspection, Part 3 gives movable bridge element descriptions, Part 4 addresses evaluation, and Part 5 covers maintenance. Appendices provide gear mechanics information, references, and a glossary. The manual is intended for bridge engineers, inspectors, and maintainers who hold operational and maintenance responsibility for these structures.