Traditional static assignment

TrafficAssignment.TRADITIONAL_STATIC

Description

The traditional static traffic assignment instance let’s you configure the most well-known of all traffic assignment methods. Implementation is based on Beckmann (1956)¹ supporting multiple time periods and modes.

¹ Beckmann, M., McGuire, C. B., & Winsten, B. W. (1956). Studies in the economics of transportation. New Haven CT, USA: Yale University Press.

Defaults

Name	Value	Type	Unit
Gap function	Object instance	Link Based Relative Duality Gap Function	N/A
Smoothing	Object instance	MSA smoothing	N/A
Physical Cost	Object instance	BPR function	N/A
Virtual Cost	Object instance	Fixed	N/A
Stop criterion	Object instance	Default	N/A

Methods

Traditional static assignment exposes the following methods

Name	Description
`.set(+)`	Choose various assignment components (e.g., physical cost, virtual cost, smoothing etc.)
`.activate_output(+)`	Activate different types of output to be included in the results
`.deactivate_output(+)`	De-activate types of output to exclude them from the results

Properties

Traditional static assignment exposes the following properties

Property	Availability	Description
`.gap_function`	Always	Access to configuration of the gap function
`.output_configuration`	Always	Access to general configuration options regarding outputs
`.path_configuration`	Post calling `.activate_output(OutputType.PATH)`	Access to configuration options regarding path output
`.link_configuration`	Always	Access to configuration options regarding link outputs
`.od_configuration`	Post calling `.activate_output(OutputType.OD)`	Access to configuration options regarding origin-destination outputs
`.physical_cost`	Post calling `.set(PhysicalCost.<Enum>)`	Access to chosen physical cost instance
`.smoothing`	Post calling `.set(Smoothing.<Enum>)`	Access to chosen smoothing method
`.virtual_cost`	Post calling `.set(VirtualCost.<Enum>)`	Access to chosen virtual cost instance

Example 1

from planit import *

# Choose to run PLANit with a traditional static traffic assignment method
planit_instance = PLANit()
planit_instance.set(TrafficAssignment.TRADITIONAL_STATIC )


# do more configuration