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CE 578 Highway Traffic Operations. Crawl Regions and Specific Grades HCM 2000. Objectives. Model vehicle operations on grades using the HCM 2000 two-lane highway directional analysis procedure Evaluate need for climbing lanes. When to Use HCM 2000 Specific Grades Procedure: Upgrades. NO

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ce 578 highway traffic operations

CE 578 Highway Traffic Operations

Crawl Regions and Specific Grades HCM 2000

Michael Dixon

objectives
Objectives
  • Model vehicle operations on grades using the HCM 2000 two-lane highway directional analysis procedure
  • Evaluate need for climbing lanes

Michael Dixon

when to use hcm 2000 specific grades procedure upgrades
When to Use HCM 2000 Specific Grades Procedure: Upgrades
  • NO
    • Level Terrain:
    • Rolling Terrain:
  • MAYBE
  • MUST

Michael Dixon

grade
% Grade
  • Upgrade same as downgrade
  • Composite grade  Total elevation change / length

Michael Dixon

length
Length

Michael Dixon

how to use the hcm 2000 specific grades procedure upgrades
How to Use the HCM 2000 Specific Grades Procedure: Upgrades
  • Use the modified directional analysis procedure making the following replacements
  • Average Travel Speeds
    • fG:
    • ET and ER:
  • PTSF
    • fG:
    • ET and ER:
  • Everything else is the same

Michael Dixon

criteria for evaluating the need for climbing lanes aashto
Criteria for Evaluating the Need for Climbing Lanes (AASHTO)
  • Upgrade traffic flow rate in excess of 200 vehicles per hour
  • Upgrade truck flow rate in excess of 20 vehicles per hour
  • One of the following conditions exists:
    • A 10 mph or greater reduction is expected for typical heavy truck
    • Level of service E or F exists on the grade
    • A reduction of two or more levels of service is experienced when moving from the approach segment to the grade

Michael Dixon

when to use hcm 2000 specific grades procedure downgrades
When to Use HCM 2000 Specific Grades Procedure: Downgrades
  • Opposing direction of any upgrade

Michael Dixon

how to use the hcm 2000 specific grades procedure downgrades
How to Use the HCM 2000 Specific Grades Procedure: Downgrades
  • Use the modified directional analysis procedure making the following replacements
  • Average Travel Speeds (no trucks at crawl speeds)
    • fG:
    • ET and ER:

Michael Dixon

how to use the hcm 2000 specific grades procedure downgrades cont
How to Use the HCM 2000 Specific Grades Procedure: Downgrades (cont.)
  • Average Travel Speeds (trucks at crawl speeds)
    • fHV:
    • fG:
    • ET and ER:
    • ETC:
  • Extra data: percentage of trucks operating at crawl speeds

Michael Dixon

how to use the hcm 2000 specific grades procedure downgrades cont2
How to Use the HCM 2000 Specific Grades Procedure: Downgrades (cont.)
  • PTSF
    • fG:
    • ET and ER:
  • Everything else is the same

Michael Dixon

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