Package org.opentrafficsim.road.gtu.lane.tactical.following

Class AbstractCarFollowingModel

java.lang.Object

org.opentrafficsim.road.gtu.lane.tactical.following.AbstractCarFollowingModel

All Implemented Interfaces:

CarFollowingModel, DesiredHeadwayModel, DesiredSpeedModel, Initialisable

Direct Known Subclasses:

AbstractIdm, ToledoCarFollowing

public abstract class AbstractCarFollowingModel
extends Object
implements CarFollowingModel

Default implementation where desired speed and headway are pre-calculated for car-following.

Copyright (c) 2013-2023 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

Author:

Wouter Schakel

Field Summary

Fields inherited from interface org.opentrafficsim.road.gtu.lane.tactical.following.CarFollowingModel

CAR_FOLLOWING_MODEL

Constructor Summary

Constructors

Constructor	Description
AbstractCarFollowingModel(DesiredHeadwayModel desiredHeadwayModel, DesiredSpeedModel desiredSpeedModel)

Method Summary

Modifier and Type	Method	Description
final Length	desiredHeadway(org.opentrafficsim.base.parameters.Parameters parameters, Speed speed)	Determines the desired headway in equilibrium conditions, i.e.
final Speed	desiredSpeed(org.opentrafficsim.base.parameters.Parameters parameters, SpeedLimitInfo speedInfo)	Determines the desired speed.
protected abstract Acceleration	followingAcceleration(org.opentrafficsim.base.parameters.Parameters parameters, Speed speed, Speed desiredSpeed, Length desiredHeadway, PerceptionIterable<? extends Headway> leaders)	Determination of car-following acceleration, possibly based on multiple leaders.
final Acceleration	followingAcceleration(org.opentrafficsim.base.parameters.Parameters parameters, Speed speed, SpeedLimitInfo speedLimitInfo, PerceptionIterable<? extends Headway> leaders)	Determination of car-following acceleration, possibly based on multiple leaders.
final void	init(LaneBasedGtu gtu)	Initialize car-following model.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.opentrafficsim.road.gtu.lane.tactical.following.CarFollowingModel

getLongName, getName

Constructor Details

AbstractCarFollowingModel

public AbstractCarFollowingModel(DesiredHeadwayModel desiredHeadwayModel,
 DesiredSpeedModel desiredSpeedModel)

Parameters:

desiredHeadwayModel - DesiredHeadwayModel; desired headway model

desiredSpeedModel - DesiredSpeedModel; desired speed model

Method Details

desiredHeadway

public final Length desiredHeadway(org.opentrafficsim.base.parameters.Parameters parameters,
 Speed speed)
                            throws org.opentrafficsim.base.parameters.ParameterException

Determines the desired headway in equilibrium conditions, i.e. no speed difference with the leader.

Specified by:

desiredHeadway in interface DesiredHeadwayModel

Parameters:

parameters - Parameters; parameters

speed - Speed; speed to determine the desired headway at

Returns:

desired headway

Throws:

org.opentrafficsim.base.parameters.ParameterException - if parameter exception occurs

desiredSpeed

public final Speed desiredSpeed(org.opentrafficsim.base.parameters.Parameters parameters,
 SpeedLimitInfo speedInfo)
                         throws org.opentrafficsim.base.parameters.ParameterException

Determines the desired speed.

Specified by:

desiredSpeed in interface DesiredSpeedModel

Parameters:

parameters - Parameters; parameters

speedInfo - SpeedLimitInfo; info regarding the desired speed for car-following

Returns:

desired speed

Throws:

org.opentrafficsim.base.parameters.ParameterException - if parameter exception occurs

followingAcceleration

public final Acceleration followingAcceleration(org.opentrafficsim.base.parameters.Parameters parameters,
 Speed speed,
 SpeedLimitInfo speedLimitInfo,
 PerceptionIterable<? extends Headway> leaders)
                                         throws org.opentrafficsim.base.parameters.ParameterException

Determination of car-following acceleration, possibly based on multiple leaders. The implementation should be able to deal with:

• The current speed being higher than the desired speed.
• The headway being negative.

Specified by:

followingAcceleration in interface CarFollowingModel

Parameters:

parameters - Parameters; parameters

speed - Speed; current speed

speedLimitInfo - SpeedLimitInfo; info regarding the desired speed for car-following

leaders - PerceptionIterable<? extends Headway>; set of leader headways and speeds, ordered by headway (closest first)

Returns:

car-following acceleration

Throws:

org.opentrafficsim.base.parameters.ParameterException - if parameter exception occurs

followingAcceleration

protected abstract Acceleration followingAcceleration(org.opentrafficsim.base.parameters.Parameters parameters,
 Speed speed,
 Speed desiredSpeed,
 Length desiredHeadway,
 PerceptionIterable<? extends Headway> leaders)
                                               throws org.opentrafficsim.base.parameters.ParameterException

Determination of car-following acceleration, possibly based on multiple leaders.

Parameters:

parameters - Parameters; parameters

speed - Speed; current speed

desiredSpeed - Speed; desired speed

desiredHeadway - Length; desired headway

leaders - PerceptionIterable<? extends Headway>; set of leader headways (guaranteed positive) and speeds, ordered by headway (closest first)

Returns:

car-following acceleration

Throws:

org.opentrafficsim.base.parameters.ParameterException - if parameter exception occurs

toString

public String toString()

Overrides:

toString in class Object

init

public final void init(LaneBasedGtu gtu)

Initialize car-following model.

Specified by:

init in interface CarFollowingModel

Specified by:

init in interface Initialisable

Parameters:

gtu - LaneBasedGtu; gtu