This chapter contains sections titled: Development of the Steel Plate Deck The Orthotropic System Relevant Specifications Deck Plate: Theory and Behavior Design Approaches Pelikan-Esslinger Method Solutions for Steel Plate Deck on Rigid Supports Effects of Flexible Floor Beams Design Considerations of the Plate Deck Floor Beam Forces and Deformations Orthotropic Plate Behavior Under Alternate Loads: Case Study Theoretical Aspects of Orthotropic Skew Steel Decks: Case Study Combined System of Plate and Girder Bending and Continuity: Skew Orthotropic Plate Structures Design Example Types of Orthotropic Plate Bridges