Roundabout

The calculation is performed according to either HCM 2010, HCM 6th Edition (Fundamentals: Roundabouts according to the HCM method ), HCM 7th Edition (Fundamentals: Roundabouts according to the HCM method ) or TRL/Kimber (Fundamentals: Roundabouts according to the TRL/Kimber method).

1.  Make sure that the values of the input attributes are correct at the nodes with control type Roundabout.

• Input attributes for calculation based on HCM (Fundamentals: Roundabouts according to the HCM method )
• Input attributes for calculation based on TRL/Kimber (Fundamentals: Roundabouts according to the TRL/Kimber method)

2.  Check and adjust the parameters on the Roundabout page.

Element	Description
HCM	Select this option for an impedance calculation based on the HCM 2010 (Fundamentals: Roundabouts according to the HCM method ).
HCM 6th Edition	Select this option for an impedance calculation based on the HCM 6th Edition (Fundamentals: Roundabouts according to the HCM method ).
HCM 7th Edition	Select this option for an impedance calculation based on the HCM 7th Edition (Fundamentals: Roundabouts according to the HCM method ).
TRL/Kimber	Select this option for an impedance calculation according to the TRL/Kimber method (Fundamentals: Roundabouts according to the TRL/Kimber method).
Maximum tCur	If this option has been checked, enter a value which is used as user-defined maximum turn penalty at the node.