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 Geometry
The 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.
© Rodel Software Ltd