design exceptions 101 ed fischer, state traffic-roadway engineer mike morrow, fhwa field operations...
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Design Exceptions 101Design Exceptions 101
Ed Fischer, State Traffic-Roadway EngineerMike Morrow, FHWA Field Operations EngineerKent R. Belleque, Senior Interchange Engineer
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Items to Cover TodayItems 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
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Chief Engineer’s RoleChief 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
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Expectations from ODOTExpectations from ODOT
• Provide Enough Information that Convinces the Reviewer to Approve not Achieving the Standard
Can we get to Yes?
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When Should the Process Begin?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
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What Should be Included?What Should be Included?
• General Discussion on the Design Exception• Evaluation of the Exception• Justification• Review and Approval (Tech Center and FHWA
Level)
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Areas of Special NoteAreas of Special Note
• Vertical Clearance and Motor Carrier Contact
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Areas of Special NoteAreas of Special Note
• 3R- Roadside Design- Documented @ Region
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Areas of Special NoteAreas of Special Note
• Form has been updated– Top 10% SPIS– Interchange Spacing
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Other Available ToolsOther Available Tools
• Highway Safety Analysis Tools – http://www.oregon.gov/ODOT/HWY/TRAFFIC-ROAD
WAY/highway_safety.shtml– Crash Data– SPIS/SIP– Crash Reduction Factors
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Flexibility in Design-FHWAFlexibility in Design-FHWA
• 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
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Flexibility in Design-AASHTOFlexibility in Design-AASHTO
• Similar to FHWA Guidance– Proper Justification– Crash analysis, Rationale
for Exception
• Stresses Importance of Documentation
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Flexibility in Design- 1R and SFFlexibility in Design- 1R and SF
• TRB Special Report 214- 3R Practices
• 1R and Single Function Impact on Design Exceptions?????
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Design Exceptions on a National Design Exceptions on a National Level Level • Dealing with Same
Issues as ODOT– Why are Design
Exceptions Done?• 42%- Reduces Liability• 40%- Design
Exception Documentation
• Number of Exceptions Varies
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NCHRP Synthesis 316NCHRP Synthesis 316
• Type of Exceptions Similar
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Planning Design ExceptionsPlanning 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
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Non-Design Exceptions IssuesNon-Design Exceptions Issues
• PLA01-Review Process for Design Concepts on ORS 366.215 Routes– Vehicle Carrying Capacity
and Lane Reductions
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Tech Services- To Do List Tech Services- To Do List
• Design Speed• Horizontal and Vertical Angle Points• 3R- Criteria A & B• Others??
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Real Life Examples: Case 1Real 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.
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Case 2: Reasons for Not Attaining Case 2: Reasons for Not Attaining StandardStandard
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The Request: Case 3The Request: Case 3
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Case 3 (Continued)Case 3 (Continued)
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The Request: Case 4The Request: Case 4
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Items to RememberItems 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
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Items to RememberItems 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
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Web Page LinksWeb Page Links
• Design Exceptions– http://egov.oregon.gov/ODOT/HWY/ENGSERVICES/de
sign_exceptions.shtml– Request Form Instructions– Required Signatures
• Technical Bulletins– http://egov.oregon.gov/ODOT/HWY/ENGSERVICES/
tech_bulletin.shtml
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Comments from ODOT and FHWAComments from ODOT and FHWA
• Ed Fischer and Mike Morrow
• Q and A