3R Standards Resurfacing, Restoration,

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3R StandardsResurfacing, Restoration,
Rehabilitation

• Ch. 7

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Objectives

• Know what 3R stands for
• Know basics of 3R standards for freeways
• Know basics of 3R standards for non-freeways

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-Freeway 3R projects (Ch 7)

• -Non-Freeway 3R projects (download from lectures)

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Resurfacing

• Placement of an additional pavement layer over
  existing traveled way to provide strength or
  improve serviceability

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Restoration Rehabilitation

• Work required to return traveled way to a
  suitable condition for resurfacing while
  improving highway safety

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3R-Freeways (Oregon DOT I-5 aerial interchange
photos)
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Standards same as HDM Ch. 2 for freeways except

• Standards of the Day (Table 7-1, pg 7-11)
• -widths of lanes, shoulders, median
• -grades
• -radii
• -SSD
• -Max. Super
• -Median width

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Needs/deficiencies should be clearly identified
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Pavt Condition Treatment

• Identify types of deterioration
• Perform a pavement evaluation
• Decide the appropriate corrective action

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Freeway 3R

• Single course overlay (40 mm)
• TL single course overlay gt40mm
• Multiple overlays
• No extensive replacement of exist. Pavt.
• No new additional travel lanes

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Soils

• Evaluate when widening pavement

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Utilities

• Relocate or remove from clear zone

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Lighting

• Rehab, upgrade or remove non-functional lighting
• Locate standards outside of clear zone or
  deflection distance of barrier, or provide
  breakaway type

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Future MPT

• Review potential improvements that could be made
  to improve future maintenance or construction on
  the freeway (check w/ maintenance)

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Traffic Data

• Mainlaine (AADT, DDHV, HV)
• Ramps (DDHV)
• Crossroads (DHV)
• Calc LOS for mainline, ramps, and intersections
• Design year (ETC10)
• Accident analysis (most recent 3 years)

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Non-Conforming Features

• LOS
• Clear Zone
• Intersection Turning Radii
• Super Routs and Roffs
• Min. Length of vertical curves
• Lane drops
• Broken back curves
• Compound curve ratios
• Accel/Decel lane lengths types
• HOV Transit Accommodations
• Weaving Lengths
• Design storm for drainage facilities
• TCD

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Medians

• Check clear zone
• Emergency crossovers (110 or flatter and
  culverts gt300 mm w/ safety grates)

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Curbs

• Usually remove
• If not removed document as a nonconforming
  feature (historical parkway, drainage, erosion
  control, structural integrity of bridge)
• Consider traversable versus non-mountable or
  mountable curb

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Clear zone

• Provide minimum of 9m
• Remove FO
• Identify hazards (cliffs, bodies of water, etc)

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Guide railing

• Consider elimination by regrading
• Bring up to current standards
• Add new to meet current warrants
• Remove trees and FO from deflection area

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TCD

• Update to current MUTCD

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Drainage-Roadside Surface Drainage System

• Site Inspection
• Recalculate flow rate/capacities if not
  functioning adequately
• Roff should not cover more than shoulder and ½ of
  travel lane to prevent hydroplaning

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Drainage- Cross Drainage Structures

• Site Inspection
• Evaluate inadequate structures
• Consider replacement of structures that are
  approaching their anticipated design life

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Drainage- Hazardous Features

• Remove
• Modify
• Shield

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3R Non-Freeways (http//www.ci.walnut-creek.ca.us
/historygifs.html
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3 MAJOR STEPS

• Assess current conditions
• Accident Data
• Site Inspections
• Design and Traffic Characteristics
• Determine project scope
• Incorporate minor improvements if cost effective
• Document design process
• Existing Conditions
• Design Criteria (3R)
• Design Exceptions
• Recommended Design

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3R Standards

• Design Speed
• Pavt./Shoulder Widths
• -Retain existing except some mins are listed or
  if causing safety/operational problems
• Pavt/Shoulder Cross Sections
• Pavt (1.5-3 accept)
• Shoulder (2-8 accept)
• Rollover lt 8
• Travel lane widths should be constant (vary
  shoulder widths if necessary)

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3R Standards

• Horizontal Curvature Superelevation
• -Compare safe operating speed (MUTCD Fig 231-1)
  to design speed. Depending on difference follow
  3R book to determine what to do.
• -Superelevation transition Use roff only as
  minimum. 50-70 on tangent 30-50 on curve
• 5. Vertical Curvature/SSD
• -Dont consider sag curves unless problem
• -Crest curves consider reconstruction if
  accident problem or all 3 below criteria are met
• i) Crest curve hides a major hazard
• ii) AADTgt1500
• iii) Safe speed gt 20mph below design speed

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3R Standards

• 6. Horizontal Clearance to FO
• -If no accident, choose minimum of what can be
  reasonably achieved
• -Evaluate guiderail for replacement
• 7. Grades
• -Retain existing unless operational or safety
  need
• 8. Bridges
• -Evaluate for rehab or replacement
• -Evaluate width using GDPB