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📏Bureau of Design & Environment (BDE) Manual
Bureau of Design & Environment (BDE) Manual
PDFIllinois Department of Transportation (IDOT)2022 Standard Specifications
IDOT's primary design policy manual covering geometrics, drainage, structures, and environmental compliance.
Local terminology: Illinois calls its design manuals "Bureau of Design & Environment (BDE) Manual" — the label used throughout this page reflects that convention.
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