The AIA v3 Layer Key Style includes line weights and linetypes that are in accordance with the Uniform Drawing System, and the colors that it specifies are compliant with the Tri-Services plotting guidelines. This is based on the AIA Version 3 Layer Standard, which is in turn compliant with the AIA Layer Guidelines version 3.0. The Imperial templates provided with AutoCAD Architecture 2021 toolset are pre-configured to load the AIA Version 3 Layer Key Style by default. While it is not required that custom content be compliant, when creating new content for use in the United States you should take this support into account. 3.1 is supported where possible in AutoCAD Architecture 2021 toolset through the use of pre-configured Layer Standards, Layer Key Styles, plot style tables and annotation tools. These consist of the AIA Layer Guidelines version 3.0, the CSI Uniform Drawing System (UDS) and the Tri-Services Plotting Guidelines. The National CAD Standard version 3.1 is a consensus standard compiled from three existing standards and guidelines by NIBS (The National Institute of Building Sciences).
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