Delineators provide guidance to a driver'

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Delineators

• Delineators provide guidance to a driver.
• Youll learn the standards for the design, color,
  and placement of delineators in this chapter.

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CHAPTER 11 OBJECTIVES

• You will be able to perform the following tasks
  after finishing this chapter
• identify different types of delineators
• describe the composition and placement of the
  delineators

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GUARDRAIL DELINEATION

• Current delineation shall be installed on all
  new, repaired, and relocated guardrail and
  terminals.

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GUARDRAIL DELINEATION(LONGITUDINAL RUNS)

• A delineator must
• be made of plastic

• be flexible in order to recover from impact
• have a minimum reflective area of 7 square
  inches
• project no more than 5 inches above the post or
  blockout
• use prismatic lens sheeting

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GUARDRAIL DELINEATION(LONGITUDINAL RUNS)

• A delineator also must
• be mounted on the web on top of steel guardrail
  blockouts

• be mounted on the web on top of the post if no
  blockout is used
• be installed on top of wood blockouts by adhesive
  or by either stainless or galvanized screws

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GUARDRAIL DELINEATION(LONGITUDINAL RUNS)

• Additionally, a delineator must
• be installed at the specified spacing
  typically, a maximum of 80 feet on centers

• reduce the spacing on curves to comply with the
  spacings specified for Interstate road edge
  delineators
• be placed to include at least one delineator
  upstream and one downstream of a guardrail
  repair
• match the color of the roadway edgelines

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GUARDRAIL DELINEATION(TERMINALS)

• Install yellow reflective sheeting (minimum size
  8" by 36") on buffered end sections.

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GUARDRAIL DELINEATION(TERMINALS)

• Install yellow reflective sheeting with black
  diagonal stripes on an impact head. The sheeting
  must cover the full area inside the end of the
  head.

• Place the sheeting so that the stripes point down
  towards the roadway.

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GUARDRAIL DELINEATION(TERMINALS)

• Experience has shown that many terminals with
  protruding impact heads are damaged during snow
  removal operations.

• A delineator tube that extends well above the
  top of the terminal can be attached to the
  terminal in
• order to mark the inside head for plow
  operators. Attach the tube directly to the side
  of the head that is closest to the roadway.

• Do not place delineator posts in front of
  terminals.

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SUMMARYDELINEATION

• Delineation provides positive guidance to driver

• Apply delineation to terminal and standard
  section according to VDOT Road and Bridge
  Standards and Specifications

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5 SELF-CHECK QUESTIONS

• 1. Delineators are made out of _____ for maximum
  _____ when hit.
• 2. Describe the delineators used on impact heads.
  What kind of material is used? What color(s)
  are used?
• 3. The black _____ stripes on an impact head
  delineator point _____ to the road.

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ANSWERS

• 1. Delineators are made out of plastic for
  maximum flexibility when hit.
• 2. Describe the delineators used on impact heads.
  What kind of material is used?
• VDOT approved delineators used on impact heads
  are made of reflective sheeting.
• What color(s) are used?
• The colors are yellow with black diagonal
  stripes.
• 3. The black diagonal stripes on an impact head
  delineator point down to the road.

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5 SELF-CHECK QUESTIONS(cont.)

• 4. Describe the delineators used on buffered end
  sections.
• What kind of material is used?
• What color(s) are used?
• 5. What color is used for delineators mounted on
  the guardrail?

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ANSWERS

• 4. Describe the delineators used on buffered end
  sections.
• What kind of material is used?
• The delineators used on buffered end sections
  are also made of reflective sheeting.
• What color(s) are used?
• They are yellow.
• 5. What color is used for delineators mounted on
  the guardrail?
• The delineator color matches the color of the
  roadway edgelines.