AASHTO LRFDLTS-1, LRFD Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, First Edition (2015), applies load and resistance factor design to sign, luminaire, traffic signal, and combination structures. Section 1 defines scope, applicable specifications, the types of structural supports, and the design philosophy with its limit states. Loads are established in Section 3, and Section 4 covers general analysis and design considerations. Material-specific provisions follow for steel, aluminum, prestressed concrete, fiber-reinforced composites, and wood. Serviceability, fatigue design, breakaway supports, and foundation design are treated in separate sections. The document closes with fabrication, materials and detailing, construction, inspection and reporting, and asset management. It is intended for designers and agencies responsible for highway appurtenance structures.