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CE 578 Highway Traffic Operations. Freeway Merge and Diverge Segments. Objectives. Scope and limitations of the methodology Outline of the methodology Critical ramp junction variables. Scope. Ramp merge and diverge operations evaluate operations (LOS A to E) identify congestion (LOS F)

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ce 578 highway traffic operations

CE 578 Highway Traffic Operations

Freeway Merge and Diverge Segments

objectives
Objectives
  • Scope and limitations of the methodology
  • Outline of the methodology
  • Critical ramp junction variables
scope
Scope
  • Ramp merge and diverge operations
    • evaluate operations (LOS A to E)
    • identify congestion (LOS F)
    • see freeway facilities chapter for analysis of congested conditions
  • ramp roadway
limitations
Limitations
  • HOV lanes
  • Ramp metering
  • Oversaturated conditions
  • Speed effects of ramp characteristics
  • Intelligent Transportation System services
merge and diverge capacities
Merge and Diverge Capacities
  • Capacities
    • Upstream segment capacity for diverge area
    • Downstream segment capacity for diverge or merge area
    • Flow entering ramp influence area
    • Flow of ramp
critical variables
Critical Variables
  • Adjusted volume (for all movements VF, VR)
    • fp see Chapter 23
    • fHV see Chapter 23
  • Ramp roadway capacity
    • Give ramp free-flow speed and number of ramp lanesSee Exhibit 25-3
  • Upstream traffic demand flow (VF)
critical variables cont
Critical Variables (cont.)
  • Proportion of traffic remaining in lanes 1 and 2 (PFM or PFD)
    • Ramp demand (VR)
    • Demand flow rate on adjacent downstream ramp (VD)
    • Demand flow rate on adjacent upstream ramp (VU)
    • Free-flow speed of ramp (SFR)
    • Length of acceleration (LA)
    • Distance to upstream ramp (Lup)
    • Distance to downstream ramp (Ldown)
  • Upstream traffic in lanes 1 and 2
    • V12 = PFM * VF
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