Package org.goplanit.cost.physical

Class SteadyStateTravelTimeCost

java.lang.Object

org.goplanit.component.PlanitComponent<AbstractPhysicalCost>

org.goplanit.cost.physical.AbstractPhysicalCost

org.goplanit.cost.physical.SteadyStateTravelTimeCost

All Implemented Interfaces:

Serializable, Cloneable, Comparable<IdAble>, EventListener, PlanitComponentListener, Cost<MacroscopicLinkSegment>, PhysicalCost, InteractorAccessor<LinkInflowOutflowAccessee>, LinkInflowOutflowAccessor, EventListener, ExternalIdAble, IdAble

public class SteadyStateTravelTimeCost
extends AbstractPhysicalCost
implements LinkInflowOutflowAccessor

Cost computation for travel times based on the work of Raadsen and Bliemer (2019), Steady-state link travel time methods: Formulation, derivation, classification, and unification.

Suitable for static and semi-dynamic traffic assignment methods that are steady-state with respect to their inflow and outflow rates which necessarily are able to take on different values, where the difference between in and outflow results in a queue on the link. Most notable assignment method that adopts this method is sLTM.

Raadsen and Bliemer (2019) highlight three main computation methods to compute the same steady-state travel time on the link level. In this implementation we utilise the so called static-functional - longitudinal method where we compute the travel time via three components: 1) free flow travel time + 2) hypocritical delay + 3) hypercritical delay

Author:

markr

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.goplanit.interactor.InteractorAccessor

LOGGER

Fields inherited from interface org.goplanit.cost.physical.PhysicalCost

BPR, FREEFLOW, STEADY_STATE

Constructor Summary

Constructors

Constructor	Description
SteadyStateTravelTimeCost(SteadyStateTravelTimeCost other)	Copy Constructor
SteadyStateTravelTimeCost(IdGroupingToken groupId)	Constructor

Method Summary

Modifier and Type	Method	Description
SteadyStateTravelTimeCost	clone()	Create a shallow copy of this entity
double	getDTravelTimeDFlow(boolean uncongested, Mode mode, MacroscopicLinkSegment linkSegment)	First Derivative towards inflowRate.
double	getGeneralisedCost(Mode mode, MacroscopicLinkSegment linkSegment)	Return the average travel time for the current link segment for a given mode
double	getTravelTimeCost(Mode mode, MacroscopicLinkSegment linkSegment)	Returns the generalised cost of travel along an edge segment for a specified mode
void	initialiseBeforeSimulation(TransportLayerNetwork<?,?> network)	Initialize the cost parameter values in the network
void	populateWithCost(UntypedPhysicalLayer<?,?,?> physicalLayer, Mode mode, double[] costToFill)	Populate the cost array with the free flow link travel times for all link segments for the specified mode
void	reset()	Full reset returns to pre-initialiseBeforeSimulation(TransportLayerNetwork) state.
void	setAccessee(LinkInflowOutflowAccessee accessee)	Set the accessee to allow access
void	updateTimePeriod(TimePeriod timePeriod)	Provide the cost calculation with information regarding the time period for which the cost is to be calculated

Methods inherited from class org.goplanit.component.PlanitComponent

equals, getComponentType, getExternalId, getId, getIdGroupingToken, getKnownSupportedEventTypes, getXmlId, hashCode, onPlanitComponentEvent, setExternalId, setXmlId

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.goplanit.utils.event.EventListener

hasKnownSupportedEventTypes

Methods inherited from interface org.goplanit.utils.id.ExternalIdAble

hasExternalId, hasXmlId

Methods inherited from interface org.goplanit.utils.id.IdAble

compareTo, idEquals, idHashCode

Methods inherited from interface org.goplanit.interactor.InteractorAccessor

setAccessee

Methods inherited from interface org.goplanit.interactor.LinkInflowOutflowAccessor

getCompatibleAccessee

Constructor Detail

SteadyStateTravelTimeCost

public SteadyStateTravelTimeCost(IdGroupingToken groupId)

Constructor

Parameters:

groupId - contiguous id generation within this group for instances of this class

SteadyStateTravelTimeCost

public SteadyStateTravelTimeCost(SteadyStateTravelTimeCost other)

Copy Constructor

Parameters:

other - to copy

Method Detail

initialiseBeforeSimulation

public void initialiseBeforeSimulation(TransportLayerNetwork<?,?> network)
                                throws PlanItException

Initialize the cost parameter values in the network

Specified by:

initialiseBeforeSimulation in class AbstractPhysicalCost

Parameters:

network - the network

Throws:

PlanItException - thrown if error

updateTimePeriod

public void updateTimePeriod(TimePeriod timePeriod)

Provide the cost calculation with information regarding the time period for which the cost is to be calculated

Specified by:

updateTimePeriod in class AbstractPhysicalCost

Parameters:

timePeriod - to apply

getGeneralisedCost

public double getGeneralisedCost(Mode mode,
                                 MacroscopicLinkSegment linkSegment)

Return the average travel time for the current link segment for a given mode

Specified by:

getGeneralisedCost in interface Cost<MacroscopicLinkSegment>

Parameters:

mode - the current Mode of travel

linkSegment - the current link segment

Returns:

the travel time for the current link (in hours)

populateWithCost

public void populateWithCost(UntypedPhysicalLayer<?,?,?> physicalLayer,
                             Mode mode,
                             double[] costToFill)
                      throws PlanItException

Populate the cost array with the free flow link travel times for all link segments for the specified mode

Overrides:

populateWithCost in class AbstractPhysicalCost

Parameters:

physicalLayer - to use

mode - the mode to use

costToFill - the cost to populate (in hours)

Throws:

PlanItException - thrown if error

clone

public SteadyStateTravelTimeCost clone()

Create a shallow copy of this entity

Specified by:

clone in interface IdAble

Specified by:

clone in class PlanitComponent<AbstractPhysicalCost>

Returns:

shallow copy of entity

setAccessee

public void setAccessee(LinkInflowOutflowAccessee accessee)

Set the accessee to allow access

Specified by:

setAccessee in interface InteractorAccessor<LinkInflowOutflowAccessee>

Parameters:

accessee - to use

reset

public void reset()

Full reset returns to pre-initialiseBeforeSimulation(TransportLayerNetwork) state.

Specified by:

reset in class PlanitComponent<AbstractPhysicalCost>

getTravelTimeCost

public double getTravelTimeCost(Mode mode,
                                MacroscopicLinkSegment linkSegment)

Returns the generalised cost of travel along an edge segment for a specified mode

Specified by:

getTravelTimeCost in interface Cost<MacroscopicLinkSegment>

Parameters:

mode - the specified mode of travel

linkSegment - the specified edge segment (which can be physical or virtual)

Returns:

the cost of travel along the specified segment

getDTravelTimeDFlow

public double getDTravelTimeDFlow(boolean uncongested,
                                  Mode mode,
                                  MacroscopicLinkSegment linkSegment)

First Derivative towards inflowRate. HypocriticalDelay is FD dependent. HyperCritical delay equates to (timePeriod duration/2) * (1/outflowRate). Get the first derivative of the used travel time computation method towards the edge segment (in) flow rate in PCU per hour, i.e. dTraveltime//dFlow.

Specified by:

getDTravelTimeDFlow in interface Cost<MacroscopicLinkSegment>

Parameters:

uncongested - flag idicating if the provided flow is uncongested or congested flow, relevant when flow can represent multiple traffic states

mode - to use

linkSegment - to use

Returns:

the first derivative of travel time for a unit flow rate change in PCU per Hour