The AASHTO LRFD Guide Specifications for Bridges Carrying Light Rail Transit Loads, Second Edition (2022), supplement the AASHTO LRFD Bridge Design Specifications for bridges subjected to light rail transit loadings, alone or in combination with highway traffic. A general section gives scope, notation, and definitions, followed by design philosophy covering limit states, load factors and combinations, and user comfort criteria for bridge deflection and passenger comfort. The loads section addresses permanent loads and light rail live loads, including application of design live load, dynamic load allowance, and derailment loads. Additional load provisions cover centrifugal and braking forces, wind, and earthquake effects. Load effects from superimposed deformations, thermal loading, rail-structure interaction, and rail break are treated as well. The specifications state minimum requirements for public safety and are intended for engineers designing bridges that carry light rail transit.