The AASHTO LRFD Bridge Design Specifications, 5th Edition (2010), provides comprehensive, reliability-based standards for designing, evaluating, and rehabilitating highway bridges. Organized into 14 sections, this edition focuses on load and resistance factor design (LRFD) methodology, incorporating specific limit states for strength, service, and extreme events. You can review the specifications at Accuris . AASHTO LRFD Bridge Design Specifications - AISC
The 5th Edition's 14 sections provide a comprehensive guide for structural engineers: The AASHTO LRFD Bridge Design Specifications, 5th Edition