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Pavement Markings--Design and Typical Layout Details (2006) / Chapter Skim
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Appendix G - Left-Turn Lane Added Between the Through Lanes of a Two-Way Highway
Pages 93-94

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From page 93...
... MONTANA The median is widened until the full width of the turn lane becomes available and then a left-turn lane taper immediately begins. The length of the left-turn lane taper is calculated from a taper rate based on design speed and is shown in the same chart.
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From page 94...
... . A second option that uses the same length as the reverse curves is to extend the double yellow centerline on the left-hand side of the approach through lane for one-eighth of the length and then leave a gap in the pavement markings until the solid lane line separating the leftturn lane from the through lane begins (the only longitudinal pavement marking in the gap area is the centerline adjacent to the departure lane in the opposite direction)
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Key Terms

  • shifting taper
  • taper begins
  • lane line
  • speed limit
  • taper rate

  • reverse curves
  • taper immediately
  • posted speed
  • rate varies
  • rate based

  • design speed
  • widened using
  • design speeds
  • ately begins
  • taper downstream

  • solid lane
  • curves starting
  • lane width
  • north dakota
  • reverse curve

  • mph design
  • data table
  • percentile speed
  • rhode island
  • culated using

  • lane begins
  • five times
  • line separating
  • comes available
  • immediately begins


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