CE 578 Highway Traffic Operations

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# CE 578 Highway Traffic Operations - PowerPoint PPT Presentation

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

Crawl Regions and Specific Grades HCM 2000

Michael Dixon

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

Michael Dixon

• NO
• Level Terrain:
• Rolling Terrain:
• MAYBE
• MUST

Michael Dixon

• Composite grade  Total elevation change / length

Michael Dixon

Length

Michael Dixon

• 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)
• 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

• Opposing direction of any upgrade

Michael Dixon

• Use the modified directional analysis procedure making the following replacements
• Average Travel Speeds (no trucks at crawl speeds)
• fG:
• ET and ER:

Michael Dixon

• Average Travel Speeds (trucks at crawl speeds)
• fHV:
• fG:
• ET and ER:
• ETC:
• Extra data: percentage of trucks operating at crawl speeds

Michael Dixon