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Design Exceptions 101

Design Exceptions 101. Ed Fischer, State Traffic-Roadway Engineer Mike Morrow, FHWA Field Operations Engineer Kent R. Belleque, Senior Interchange Engineer. Items to Cover Today. Design Exception Background Key Items in Design Exceptions Timelines Evaluation Criteria Justification

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Design Exceptions 101

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  1. Design Exceptions 101 Ed Fischer, State Traffic-Roadway Engineer Mike Morrow, FHWA Field Operations Engineer Kent R. Belleque, Senior Interchange Engineer

  2. Items to Cover Today • Design Exception Background • Key Items in Design Exceptions • Timelines • Evaluation Criteria • Justification • Helpful Tools • Planning Level Design Exceptions • Case Studies (Helpful Hints) • Expectations from Ed and Mike • Q & A

  3. Chief Engineer’s Role • Authority for Design Standards • Outlined in Title 23 CFR 625 • Oregon Highway Design Manual (HDM) Approval of Exceptions to Standards • Delegated to State Roadway Engineer • Contact with FHWA on Process

  4. Expectations from ODOT • Provide Enough Information that Convinces the Reviewer to Approve not Achieving the Standard Can we get to Yes?

  5. When Should the Process Begin? • Start Discussion ASAP with ODOT • Allow Sufficient Time for Review • May also Require Approval by FHWA • Insufficient Data will Require More Time

  6. What Should be Included? • General Discussion on the Design Exception • Evaluation of the Exception • Justification • Review and Approval (Tech Center and FHWA Level)

  7. Areas of Special Note • Vertical Clearance and Motor Carrier Contact

  8. Areas of Special Note • 3R- Roadside Design- Documented @ Region

  9. Form has been updated Top 10% SPIS Interchange Spacing Areas of Special Note

  10. Other Available Tools • Highway Safety Analysis Tools • http://www.oregon.gov/ODOT/HWY/TRAFFIC-ROADWAY/highway_safety.shtml • Crash Data • SPIS/SIP • Crash Reduction Factors

  11. Design Exceptions Consideration of Safety and Operations Consideration of Crash History and Roadway Character Cost to Attain Full Standard and Impact on Environmental Features Degree of Reduction Impact on other Standards Mitigation Flexibility in Design-FHWA

  12. Similar to FHWA Guidance Proper Justification Crash analysis, Rationale for Exception Stresses Importance of Documentation Flexibility in Design-AASHTO

  13. TRB Special Report 214- 3R Practices 1R and Single Function Impact on Design Exceptions????? Flexibility in Design- 1R and SF

  14. Dealing with Same Issues as ODOT Why are Design Exceptions Done? 42%- Reduces Liability 40%- Design Exception Documentation Number of Exceptions Varies Design Exceptions on a National Level

  15. Type of Exceptions Similar NCHRP Synthesis 316

  16. Planning Design Exceptions • Planning Studies Need to Follow Design Standards • Design Elements Need to Meet Standard or Get an Exception • If Elements are Unknown, don't Show Specific Dimensions • Timing of Planning Design Exceptions • Construction in 5 years-Process the Exception Before Putting in Planning Document • Construction in 5-10 years-Submit Draft Design Exception and Obtain Written Indication of Approval/Denial

  17. PLA01-Review Process for Design Concepts on ORS 366.215 Routes Vehicle Carrying Capacity and Lane Reductions Non-Design Exceptions Issues

  18. Tech Services- To Do List • Design Speed • Horizontal and Vertical Angle Points • 3R- Criteria A & B • Others??

  19. Real Life Examples: Case 1 Specifically it is requested that the following design features not be further evaluated: horizontal alignment, vertical alignment, grades, lane width, shoulder width, bridge width and the correction of deficient bridge rails and missing ADA sidewalk features, roadway cross slopes, cut/fill/ditch slopes, access, and clear zone.

  20. Case 2: Reasons for Not Attaining Standard

  21. The Request: Case 3

  22. Case 3 (Continued)

  23. The Request: Case 4

  24. Items to Remember • Look at Crash Data • Number and Type of Exceptions • Cost by Itself is not a Good Justification • Look for Ways to Mitigate • Striping • Signing • Illumination

  25. Items to Remember • Identify Design Exceptions ASAP • Work with Design Exception Review Team in Salem • Christopher Henson Rural Roadway Engineer • Rich Crossler-Laird Urban Roadway Engineer • Kent Belleque Interchange Engineer • Dan MacDonald Roadside Safety Engineer • Dave Polly Standards Engineer • And Others • Allow Sufficient Time for Processing

  26. Web Page Links • Design Exceptions • http://egov.oregon.gov/ODOT/HWY/ENGSERVICES/design_exceptions.shtml • Request Form Instructions • Required Signatures • Technical Bulletins • http://egov.oregon.gov/ODOT/HWY/ENGSERVICES/tech_bulletin.shtml

  27. Comments from ODOT and FHWA • Ed Fischer and Mike Morrow • Q and A

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