Modified Form 464 - Design Exception Variance Request
2018-6. October 3, 2018. This modified Form 464 reflects that designers are encouraged to support design exception variance requests with Data Driven Safety Analysis (DDSA) when practical.
https://www.codot.gov/business/designsupport/bulletins_manuals/design-bulletins/db-2018-6
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Modified Form 464 - Design Exception Variance Request
2018-6. October 3, 2018. This modified Form 464 reflects that designers are encouraged to support design exception variance requests with Data Driven Safety Analysis (DDSA) when practical.