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Pages 44-48

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From page 44...
... 44 This chapter presents recommended procedures to assess removal or mitigation of horizontal sight obstructions. The primary procedure is for application to existing sight obstructions.
From page 45...
... Assessing Removal or Mitigation of Horizontal Sight Obstructions 45 – Design speed of horizontal curve from as-built plans (mph) , if available and if still applicable to current conditions – Posted speed limit (mph)
From page 46...
... 46 Design Guidelines for Horizontal Sightline Offsets the causation of the crash other than limited sight distance. Crashes of the types considered possibly related to sight distance should be eliminated from consideration if: – The crash location was misreported, and the crash did not occur at the site in question.
From page 47...
... Assessing Removal or Mitigation of Horizontal Sight Obstructions 47 – There is a documented pattern of crashes potentially related to sight distance, as defined in Step 9. – The values from the spreadsheet tool for both the number and percentage of approaching vehicles potentially affected by the sight distance restriction are relatively high, as discussed in Step 10.
From page 48...
... 48 Design Guidelines for Horizontal Sightline Offsets • Depending on the location and offset of the horizontal sight obstructions, sight distance limitations may extend upstream of a horizontal curve and may end before the PT of the curve is reached. • Advisory speed signing is useful for warning drivers of the need to slow down, but does not necessarily result in drivers traveling at or below the advisory speed.

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