Specifying an automatic allocation of the turn type

You can specify which turn types will be set for new turns. This is the case, for example, if you insert or split a link. Turn types of existing turns at the nodes affected are not changed by this. Changes to other network objects, for example changes to link attributes, do not cause an automatic recalculation of the type either.

1.  From the Network menu, choose Network settings.

The Network settings window opens.

2.  Select the Network objects tab.

3.  In the Initial allocation of turn type section, check the desired option.

Element

Description

According to the angle of the turn

The type is allocated based on the angle of the (main) turn:

  • Angle < (180 - 45)°: type 1 is allocated to the (main) turn (right).
  • (180 - 45)° ≤ angle ≤ (180 + 45)°: type 2 is allocated to the (main) turn (straight on).
  • Angle > (180 + 45)°: type 3 is allocated to the (main) turn (left).
  • From link = To link or From leg = To leg (based on the link orientation): type 4 is allocated to the (main) turn (U-turn).

Of turns open for PrT for HCM-compliant calculations

The type is allocated automatically if the (main) turn is "open for private transport". Otherwise type 0 is allocated to them.

“Open for PrT” means that the From-link and the turn are open for at least one PrT transport system. The From-link and the To-link have at least one lane.

For the allocation, the following rules apply:

  • Only one outgoing straight turn (type 2) is permitted per link.
  • Of all (main) turns of a (main) node which deviate at the maximum 45° from 180°, type 2 is allocated to the (main) turn which is closest to 180°.
  • All (main) turns with an angle > straight are left turns and type 3 is allocated to them.
  • All (main) turns with an angle < straight are right turns and type 1 is allocated to them.

Note

If the network contains more than one straight turn per link to the node (or straight main turns per leg to the main node), HCM-compliant calculations (ICA, SBA) cannot be calculated.

Note: For the automatic allocation, all (main) turns of a (main) node are taken into account.

4.  Confirm with OK.

The settings are applied.

Notes: You can edit the (main) turn types manually later on (Editing turns in the Junction editor and Editing main turns in the Junction editor).

Subsequently, you can allocate the attribute default values for t0 and CapPrT to the (main) turns (Managing turn standards).