Data model for signal cycle and split optimization

The following attributes of network objects are relevant for the cycle and split optimization:

Network object type	Attribute	Description
Signal controllers and subordinated objects	All attributes that describe the signal times of the currently set signal program	Signal times and stage distribution in the initial state
Signal controller	Reference to signal coordination groups	At cycle time optimization with procedure parameter Use cycle times of coordination groups = true, only one member of the cycle time family of the coordination group is selected as a new cycle time.
Signal coordination group	Cycle time family
Signal controller	ICA maximum cycle time for optimization ICA minimum cycle time for optimization	At cycle time optimization with procedure parameter Use cycle times of coordination groups = false, the new cycle time is selected from the interval between these two attributes.
Signal controller	Optimization method	None (signal time optimization for the signal controller at this node) Green time Cycle time and green time
Signal controller	Turned off	If the signal controller has been turned off, no signal time optimization will be calculated for the node (main node). This attribute is calculated and derived from the value for the signal program number attribute. A signal controller is considered to be switched off if the signal program number is 0 (Vissig type) or 99 (RBC type), or if an invalid signal program number is set.
Turn	The attribute for the design hourly volume set in the procedure parameters	Turn volumes Specify this value as an hourly volume.
Node model and subordinate objects	All geometry attributes	Lane allocation at node

Optimization is controlled by the following procedure parameters (components of the procedure parameters for intersection capacity analysis):

Procedure parameter	Data type (Standard)	Description
UseCycleTimeFamily	Bool (True)	At cycle time optimization with procedure parameter UseCycleTimeFamily=True, only one member of the cycle time family of the coordination group (if available) is selected as a new cycle time.
Precision of computation	Full seconds or tenths of seconds	Use this parameter to specify whether full seconds or tenths of a second are permitted as green time start and end (RBC only). With Vissig controls, this is determined by the switching frequency of the signal controller.

Procedure parameter

Data type (Standard)

Description

UseCycleTimeFamily

Bool (True)

At cycle time optimization with procedure parameter UseCycleTimeFamily=True, only one member of the cycle time family of the coordination group (if available) is selected as a new cycle time.

Precision of computation

Full seconds or tenths of seconds

Use this parameter to specify whether full seconds or tenths of a second are permitted as green time start and end (RBC only).

With Vissig controls, this is determined by the switching frequency of the signal controller.