When conditions warrant, a design exception may be granted for a project design that proposes one or more controlling substandard design elements (CSDEs). A design exception may be approved when it can be documented that a lesser design value is the best practical alternative. The factors to be considered when determining if a lesser design value should be elected shall include social, economic and environmental impacts together with safe and efficient traffic operations.
Section Index
- Section 1 - General
- Section 2 - Controlling Design Elements
- Section 3 - Design Standards
- Section 4 - Projects Requiring a Design Exception
- Section 5 - Projects Exempt
- Section 6 - Design Exception Report Format
- Section 7 - Accident Analysis
- Section 8 - Flow Chart of Design Exception Process
- Attachment 1 - Cover Letter
- Attachment 2 - List of Controlling Substandard Design Elements
- Attachment 3 - Checklist of Impacts of Controlling Substandard Design Elements
- Attachment 4 - Tables
- Appendix A - Vertical Curve Conversion
- Appendix B - Low Cost Safety Measures
- Appendix C - Sample Design Exceptions
BDC announcement BDC11T-01
(Jauary 3, 2012)
Design Exception Manual
(pdf 515k)
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