Introducing Rodel
Entry Capacity
Calibration
Arrival Turning Flows
Traffic Flows
Flow Modifiers
Average Daily Traffic
Time-sliced Profile
Geometric Parameters
Approach Geometry
Entry Geometry
Entry Width E
Number of Entry Lanes ne
Flare Length L'
Entry Radius R
Entry Angle Phi (Ф)
Circulating Geometry
Exit Geometry
Capacity Modifiers
Calibration
Bypass Geometry
Bypass Approach
Bypass Entry
Bypass Exit
Accidents
Accident Models
Accident Geometry
Economics
Geometry > Entry Geometry
Entry Geometry
The widths and radii of the entry lanes is an important factor in determining the queues and delays at the roundabout.
Topics covered:
- Entry Geometry
- The entry geometry has five parameters displayed in the data table below.
- Entry Width E
- The HCM model uses the number of entry lanes only and does not use the Entry Width.
- Number of Entry Lanes ne
- The HCM capacity model includes ne.
- Flare Length L’
- Flare length is the distance from the entry to the halfway point in the approach.
- Entry Radius R
- HCM does not use the entry radius R.
- Entry Angle Phi (Ф)
- The HCM model does not use the entry angle Phi.
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