Introducing Rodel Entry Capacity Calibration Arrival Turning Flows Traffic Flows Flow Modifiers Average Daily Traffic Time-sliced Profile Geometric Parameters Approach Geometry Leg name Graphical Geometry Editor Bearing Grade Separation G Approach Half Width V Number of Approach Lanes nv Entry Geometry Circulating Geometry Exit Geometry Capacity Modifiers Calibration Bypass Geometry Bypass Approach Bypass Entry Bypass Exit Accidents Accident Models Accident Geometry Economics |
Geometry > Approach Geometry ## Approach GeometryThe widths and radii of the approach roads. ## Topics covered**Approach Geometry**- Approach Geometry has six parameters displayed in the main window on the first data table.
**Leg name**- Legs are numbered counterclockwise for right hand driving. Leg 1 can be chosen arbitrarily, but it helps avoid mistakes if a convention is adopted.
**Graphical Geometry Editor**- The column of buttons after Leg Names calls the graphical geometry editor.
**Bearing**- This is the whole circle bearing taken in a counterclockwise direction for right hand side driving (RHD).
**Grade Separation G**- Grade Separation is not used in the HCM model.
**Approach Half Width V**- This is the narrowest width of the approach road prior to any widening (flaring) up to the roundabout entry.
**Number of Approach Lanes nv**- A maximum of 4 lanes (40 ft) is permitted.
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