AASHTO Guidelines for Risk-Based Inspection and Strength Evaluation of Suspension Bridge Main Cable Systems, First Edition (2025), set out a risk-based methodology for inspecting and evaluating the main cables of suspension bridges. A general section introduces the approach, after which the guidelines cover initial data gathering and field inspection of cable systems. Testing and synthesis of collected data are then described, leading into procedures for estimating cable strength. A final section presents the risk-based method for determining the timing of subsequent inspections, applying risk-based inspection principles to main cables. The sequence moves from field observation through testing to strength evaluation and inspection planning. The guidelines are intended for bridge owners and engineers responsible for the inspection and strength evaluation of suspension bridge main cable systems.