The AASHTO Guide Specifications for Design of Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements, Second Edition (2023), govern the use of externally bonded fiber-reinforced polymer systems on reinforced and prestressed concrete highway bridge elements. An introductory section defines the scope of the specifications and describes the FRP systems covered. The design provisions address strengthening for flexure, including flanged sections, and treat prestressed concrete members. This edition aligns the specifications with the strain approaches of ACI 440 and adds factors accounting for environmental exposure conditions. The provisions are written for engineers evaluating and strengthening existing concrete bridge elements. They are intended for agency bridge engineers, consultants, and contractors planning FRP repair and strengthening projects.