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

Class IDMPlusOld

java.lang.Object

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

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

All Implemented Interfaces:

Serializable, CarFollowingModel, GTUFollowingModelOld

public class IDMPlusOld
extends AbstractGTUFollowingModelMobil
implements Serializable

IDMPlus implements the Integrated Lane Change Model with Relaxation and Synchronization as published by Wouter J. Schakel, Bart van Arem, Member, IEEE, and Bart D. Netten. 2012.
There are two nasty type setting errors in equation 7 in this published version of the paper. Both times an equals sign (=) after a_gain should not be there.

Copyright (c) 2013-2017 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

Version:

$Revision: 1408 $, $LastChangedDate: 2015-09-24 15:17:25 +0200 (Thu, 24 Sep 2015) $, by $Author: pknoppers $, initial version Jul 4, 2014

Author:

Peter Knoppers

See Also:

Serialized Form

Field Summary

Fields inherited from class org.opentrafficsim.road.gtu.lane.tactical.following.AbstractGTUFollowingModelMobil

TOODANGEROUS

Constructor Summary

Constructors

Constructor and Description
IDMPlusOld() Construct a new IDM+ car following model with reasonable values (reasonable for passenger cars).
IDMPlusOld(org.djunits.value.vdouble.scalar.Acceleration a, org.djunits.value.vdouble.scalar.Acceleration b, org.djunits.value.vdouble.scalar.Length s0, org.djunits.value.vdouble.scalar.Duration tSafe, double delta) Construct a new IDMPlus car following model.

Method Summary

Modifier and Type	Method and Description
org.djunits.value.vdouble.scalar.Acceleration	computeAcceleration(org.djunits.value.vdouble.scalar.Speed followerSpeed, org.djunits.value.vdouble.scalar.Speed followerMaximumSpeed, org.djunits.value.vdouble.scalar.Speed leaderSpeed, org.djunits.value.vdouble.scalar.Length headway, org.djunits.value.vdouble.scalar.Speed speedLimit) Compute the acceleration that would be used to follow a leader.
org.djunits.value.vdouble.scalar.Acceleration	computeAcceleration(org.djunits.value.vdouble.scalar.Speed followerSpeed, org.djunits.value.vdouble.scalar.Speed followerMaximumSpeed, org.djunits.value.vdouble.scalar.Speed leaderSpeed, org.djunits.value.vdouble.scalar.Length headway, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Duration stepSize) Compute the acceleration that would be used to follow a leader.
org.djunits.value.vdouble.scalar.Length	desiredHeadway(org.opentrafficsim.core.gtu.behavioralcharacteristics.BehavioralCharacteristics behavioralCharacteristics, org.djunits.value.vdouble.scalar.Speed speed) Determines the desired headway in equilibrium conditions, i.e.
org.djunits.value.vdouble.scalar.Speed	desiredSpeed(org.opentrafficsim.core.gtu.behavioralcharacteristics.BehavioralCharacteristics behavioralCharacteristics, SpeedLimitInfo speedInfo) Determines the desired speed.
org.djunits.value.vdouble.scalar.Acceleration	followingAcceleration(org.opentrafficsim.core.gtu.behavioralcharacteristics.BehavioralCharacteristics behavioralCharacteristics, org.djunits.value.vdouble.scalar.Speed speed, SpeedLimitInfo speedInfo, SortedMap<org.djunits.value.vdouble.scalar.Length,org.djunits.value.vdouble.scalar.Speed> leaders) Determination of car-following acceleration, possibly based on multiple leaders.
String	getLongName() Return the complete name of the car-following model.
org.djunits.value.vdouble.scalar.Acceleration	getMaximumSafeDeceleration() Return the maximum safe deceleration for use in gap acceptance models.
String	getName() Return the name of the car-following model.
org.djunits.value.vdouble.scalar.Duration	getStepSize() Return the standard step size of this GTU following model.
void	setA(org.djunits.value.vdouble.scalar.Acceleration a) Set value of acceleration parameter.
void	setFspeed(double fSpeed) Set value of desired speed factor.
void	setT(org.djunits.value.vdouble.scalar.Duration t) Set value of desired headway.
String	toString()

Methods inherited from class org.opentrafficsim.road.gtu.lane.tactical.following.AbstractGTUFollowingModelMobil

computeAccelerationStep, computeAccelerationStep, computeAccelerationStep, computeAccelerationStep, computeAccelerationStepWithNoLeader, computeAccelerationStepWithNoLeader, computeDualAccelerationStep, computeDualAccelerationStep, minimumHeadway

Methods inherited from class java.lang.Object

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

Constructor Detail

IDMPlusOld

public IDMPlusOld()

Construct a new IDM+ car following model with reasonable values (reasonable for passenger cars).
These values are from Integrated Lane Change Model with Relaxation and Synchronization by Wouter J. Schakel, Victor L. Knoop, and Bart van Arem, published in Transportation Research Record: Journal of the Transportation Research Board, No. 2316, Transportation Research Board of the National Academies, Washington, D.C., 2012, pp. 47–57.

IDMPlusOld

public IDMPlusOld(org.djunits.value.vdouble.scalar.Acceleration a,
                  org.djunits.value.vdouble.scalar.Acceleration b,
                  org.djunits.value.vdouble.scalar.Length s0,
                  org.djunits.value.vdouble.scalar.Duration tSafe,
                  double delta)

Construct a new IDMPlus car following model.

Parameters:

a - Acceleration; the maximum acceleration of a stationary vehicle (normal value is 1 m/s/s)

b - Acceleration; the maximum deemed-safe deceleration (this is a positive value)

s0 - Length; the minimum stationary headway

tSafe - Duration; the minimum time-headway

delta - double; the speed limit adherence (1.0; mean free speed equals the speed limit; 1.1: mean free speed equals 110% of the speed limit; etc.)

Method Detail

computeAcceleration

public final org.djunits.value.vdouble.scalar.Acceleration computeAcceleration(org.djunits.value.vdouble.scalar.Speed followerSpeed,
                                                                               org.djunits.value.vdouble.scalar.Speed followerMaximumSpeed,
                                                                               org.djunits.value.vdouble.scalar.Speed leaderSpeed,
                                                                               org.djunits.value.vdouble.scalar.Length headway,
                                                                               org.djunits.value.vdouble.scalar.Speed speedLimit)

Compute the acceleration that would be used to follow a leader.

Specified by:

computeAcceleration in interface GTUFollowingModelOld

Parameters:

followerSpeed - Speed; the speed of the follower at the current time

followerMaximumSpeed - Speed; the maximum speed that the follower is capable of driving at

leaderSpeed - Speed; the speed of the follower at the current time

headway - Length; the net headway (distance between the front of the follower to the rear of the leader) at the current time, or the maximum distance we can cover at the current time, e.g. as the result of a lane drop

speedLimit - Speed; the local speed limit

Returns:

Acceleration; the acceleration (or, if negative, deceleration) resulting from application of the GTU following model

computeAcceleration

public final org.djunits.value.vdouble.scalar.Acceleration computeAcceleration(org.djunits.value.vdouble.scalar.Speed followerSpeed,
                                                                               org.djunits.value.vdouble.scalar.Speed followerMaximumSpeed,
                                                                               org.djunits.value.vdouble.scalar.Speed leaderSpeed,
                                                                               org.djunits.value.vdouble.scalar.Length headway,
                                                                               org.djunits.value.vdouble.scalar.Speed speedLimit,
                                                                               org.djunits.value.vdouble.scalar.Duration stepSize)

Compute the acceleration that would be used to follow a leader.

Specified by:

computeAcceleration in interface GTUFollowingModelOld

Parameters:

followerSpeed - Speed; the speed of the follower at the current time

followerMaximumSpeed - Speed; the maximum speed that the follower is capable of driving at

leaderSpeed - Speed; the speed of the follower at the current time

headway - Length; the net headway (distance between the front of the follower to the rear of the leader) at the current time, or the maximum distance we can cover at the current time, e.g. as the result of a lane drop

speedLimit - Speed; the local speed limit

stepSize - given step size, which can be longer or shorter than the provided step size in the algorithms.

Returns:

Acceleration; the acceleration (or, if negative, deceleration) resulting from application of the GTU following model

getStepSize

public final org.djunits.value.vdouble.scalar.Duration getStepSize()

Return the standard step size of this GTU following model.

Specified by:

getStepSize in interface GTUFollowingModelOld

Returns:

Duration; the standard step size of the GTU following model

getMaximumSafeDeceleration

public final org.djunits.value.vdouble.scalar.Acceleration getMaximumSafeDeceleration()

Return the maximum safe deceleration for use in gap acceptance models. This is the deceleration that may be enforced upon a new follower due to entering a road or changing into an adjacent lane. The result shall be a positive value. In most car following models this value is named b.

Specified by:

getMaximumSafeDeceleration in interface GTUFollowingModelOld

Returns:

Acceleration; must be a positive value!

getName

public final String getName()

Return the name of the car-following model.

Specified by:

getName in interface CarFollowingModel

Returns:

name of the car-following model

getLongName

public final String getLongName()

Return the complete name of the car-following model.

Specified by:

getLongName in interface CarFollowingModel

Returns:

complete name of the car-following model

setA

public final void setA(org.djunits.value.vdouble.scalar.Acceleration a)

Set value of acceleration parameter.

Specified by:

setA in interface GTUFollowingModelOld

Parameters:

a - value to set

setT

public final void setT(org.djunits.value.vdouble.scalar.Duration t)

Set value of desired headway.

Specified by:

setT in interface GTUFollowingModelOld

Parameters:

t - desired headway

setFspeed

public final void setFspeed(double fSpeed)

Set value of desired speed factor.

Specified by:

setFspeed in interface GTUFollowingModelOld

Parameters:

fSpeed - desired speed factor

desiredSpeed

public final org.djunits.value.vdouble.scalar.Speed desiredSpeed(org.opentrafficsim.core.gtu.behavioralcharacteristics.BehavioralCharacteristics behavioralCharacteristics,
                                                                 SpeedLimitInfo speedInfo)
                                                          throws org.opentrafficsim.core.gtu.behavioralcharacteristics.ParameterException

Determines the desired speed.

Specified by:

desiredSpeed in interface CarFollowingModel

Parameters:

behavioralCharacteristics - behavioral characteristics

speedInfo - info regarding the desired speed for car-following

Returns:

desired speed

Throws:

org.opentrafficsim.core.gtu.behavioralcharacteristics.ParameterException - if parameter exception occurs

desiredHeadway

public final org.djunits.value.vdouble.scalar.Length desiredHeadway(org.opentrafficsim.core.gtu.behavioralcharacteristics.BehavioralCharacteristics behavioralCharacteristics,
                                                                    org.djunits.value.vdouble.scalar.Speed speed)
                                                             throws org.opentrafficsim.core.gtu.behavioralcharacteristics.ParameterException

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

Specified by:

desiredHeadway in interface CarFollowingModel

Parameters:

behavioralCharacteristics - behavioral characteristics

speed - speed to determine the desired headway at

Returns:

desired headway

Throws:

org.opentrafficsim.core.gtu.behavioralcharacteristics.ParameterException - if parameter exception occurs

followingAcceleration

public final org.djunits.value.vdouble.scalar.Acceleration followingAcceleration(org.opentrafficsim.core.gtu.behavioralcharacteristics.BehavioralCharacteristics behavioralCharacteristics,
                                                                                 org.djunits.value.vdouble.scalar.Speed speed,
                                                                                 SpeedLimitInfo speedInfo,
                                                                                 SortedMap<org.djunits.value.vdouble.scalar.Length,org.djunits.value.vdouble.scalar.Speed> leaders)
                                                                          throws org.opentrafficsim.core.gtu.behavioralcharacteristics.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:

behavioralCharacteristics - behavioral characteristics

speed - current speed

speedInfo - info regarding the desired speed for car-following

leaders - set of leader headways and speeds, ordered by headway (closest first)

Returns:

car-following acceleration

Throws:

org.opentrafficsim.core.gtu.behavioralcharacteristics.ParameterException - if parameter exception occurs

toString

public final String toString()

Overrides:

toString in class Object