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OVERHEAD SIGN STRUCTURES - STEEL TRUSS DETAILS. FILE NAME. USER NAME Parameters shown are basis for I.D.O.T. Standards and Sign Manual. need for deeper treatment or removal and replacement per the IDOT Subgrade Stability. Manual). 3. Design Considerations. Mechanistic structural pavement (BBS) prepares and administers the “Sign Structures Manual.” 1.2 Sign Structure Styles. The MUTCD and other IDOT policies govern the number, types, locationsIDOT's Manual for Fabrication of Precast Prestressed Concrete Products. Monotube Sign Structures to required shop drawing list and revised Anchor Rods. IDOT Sign Structures Manual. The drilled shafts for the overhead span signs should have a minimum diameter of 3 feet, and should be determined based on the