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CE 578 Highway Traffic Operations

CE 578 Highway Traffic Operations. Freeways Ramps and Ramp Junctions Examples and Special Applications for Merge Areas. Objectives. Analysis for six-lane freeways Analysis for eight-lane freeways Analysis of special cases. Special Cases. Ten-lane freeways Two-lane on-ramp

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CE 578 Highway Traffic Operations

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  1. CE 578 Highway Traffic Operations Freeways Ramps and Ramp Junctions Examples and Special Applications for Merge Areas Michael Dixon

  2. Objectives • Analysis for six-lane freeways • Analysis for eight-lane freeways • Analysis of special cases Michael Dixon

  3. Special Cases • Ten-lane freeways • Two-lane on-ramp • Major merge areas • Lane additions • Left-hand on-ramp Michael Dixon

  4. Special Cases: Ten-Lane Freeways • Same as eight lane analysis • Use Exhibit 25-11 • Use Equation 25-7 • Use vF4eff in Eight-lane equation for PFM Michael Dixon

  5. Special Cases: Two-Lane On-Ramp Michael Dixon

  6. Special Cases: Two-Lane On-Ramp • Densities • Relative operations • Two changes to basic methodology • Calculation of PFM • Length of acceleration lane for calculation of density • Capacity values are unaffected for vFO and vR12. Michael Dixon

  7. Special Cases: Major Merge Areas Michael Dixon

  8. Special Cases: Major Merge Areas • Each entering roadways is at or near freeway design standards • No acceleration lanes involved • Analyze as if the two entering and the one exiting legs are basic freeway sections, using Exhibit 25-7 Michael Dixon

  9. Special Cases: Lane Additions • One lane addition • ramp roadway capacity governs • analyze downstream leg as basic freeway section • Two lane addition: analyze as major merge area • Lane dropped within 2500 ft: analyze as weaving area Michael Dixon

  10. Special Cases: Left-Hand On-Ramp • Influence area same length  left two lanes • Calculate PFM for left two lanes • Capacity • Density • Speed Michael Dixon

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