design exceptions presented by david joe polly pe, pls, wre senior standards engineer roadway...
TRANSCRIPT
Design ExceptionsDesign Exceptions
Presented by David Joe Polly PE, PLS, WRESenior Standards EngineerRoadway Engineering Unit
503-986-3738
Items to Keep in Mind for Design Items to Keep in Mind for Design ExceptionsExceptions
• Justification Process for a Good Decision• Start Discussion ASAP with ODOT
– Difficult Design Exceptions• Design Speed/ADA Requirements/Bridge Rail
• Allow Sufficient Time for Review• NHS Design Exceptions Must also be Approved by
FHWA• Design Exception Process is Outlined in Chapter 13
of the HDM
Know the StandardsKnow the Standards
• Type of Project• We have different standards based on type of
project
• Location of Project• STA, UBA, Urban, and Rural effect the standards
• Functional Classification• Interstate Freeway and Rural Collector are
different
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.
Items to RememberItems to Remember
• Look at accident data• Number and type of exceptions• Cost by itself is not a good justification• Look for ways to Mitigate
– Striping– Signing– Illumination
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
• Allow Proper Time for Processing