Typical Sections All graphics taken from Ch 3 of HDM

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Typical SectionsAll graphics taken from Ch 3 of
HDM

• CTC 440

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Objectives

• Know what a typical section is and what may be
  included in a typical section

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Typical Sections

• Show the physical shape and highway elements to
  be used when the project is constructed
• Typical sections are generally included in a set
  of design plans
• Several sections may be needed to describe a
  project

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Typical Elements

• Number and width of lanes/shoulders
• Thickness of pavement layers
• Item s
• Payment limits
• Cut/fill slopes
• Ditch/gutter/curb/sidewalk locations

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Control Lines

• Show how the typical section is located w/
  respect to horizontal/vertical control
• HCL-horizontal control line
• TGL-theoretical grade line
• POR-point of rotation

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Lane Width

• Show typical lane widths

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Cross slopes superelevation

• Show typical pavt cross slope
• Show superelevated sections

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Pavement Sections

• Show pavement materials
• Show thickness of various layers

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Superpave

• New Superpave (from 1999)
• Old design was the Marshall mix
• Superpave more complicated (refer to HDM Ch 3 and
  Pavement Design Manual)

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Shoulders

• Shoulder width/cross slope
• Rollover limitations
• Shoulder thickness/materials
• Conventional (being phased out)
• ESAL (full-depth
• Shoulder break (0.7 m)
• Guide rail placement
• Lateral Support to the shoulder
• Delineation
• ARD-Audible roadway delineators

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Clear Zones

• Distance from edge of traveled way to an actual
  obstacle or potential hazard.
• If FO are to be removed typical sections should
  show clear zone
• If not practical to provide a reasonable clear
  zone, a barrier system should be provided

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Barriers

• Guide Rail
• Box beam
• Corrugated
• Cable
• Concrete Barriers

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Medians-width and treatment
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Curbs

• Type
• Non-mountable
• Mountable
• Traversable
• Combination curb-gutter
• Asphalt
• Stone

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Gutters

• Collect runoff
• Use flattened and widened section for drives

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Sidewalks

• Set back as far as practicable (snow storage,
  pedestrian space)
• Thickness (100mm or 150mm_at_ drives)
• Materials
• Concrete
• Asphalt (short-term)
• Bricks or pavers (historical/aesthetic)

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Embankment (fill) slopes

• For maintenance and safety--should be flat as
  possible
• 13 max w/o guide rail
• 12 w/ guide rail

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Ditches

• Show ditch dimensions/slopes
• Should provide traversable ditches (16 down
  1.2m-width 14 out) w/in clear zone
• If cant provide traversable ditches consider
  guide rail (or use professional judgementguide
  rails in themselves can potentially be hazardous)

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ROW Width

• Sometimes shown on typical sections

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Modifications needing Typical Sections

• Overlays
• Cracking Seating
• Rubblizing
• Lane Additions and Widening
• Miscellaneous
• Edge drains
• Adding curbs to existing pavts.