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

Class AbstractGTUFollowingModelMobil

java.lang.Object

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

All Implemented Interfaces:

CarFollowingModel, GTUFollowingModelOld

Direct Known Subclasses:

FixedAccelerationModel, IDMOld, IDMPlusOld, SequentialFixedAccelerationModel

public abstract class AbstractGTUFollowingModelMobil
extends Object
implements GTUFollowingModelOld

Code shared between various car following models.
Note: many of the methods have a maxDistance, which may be "behind" the location of the next GTU, or stand-alone. Note that the maxDistance is equivalent to a GTU with zero speed, and not equivalent to a moving GTU.

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 19 feb. 2015

Author:

Alexander Verbraeck, Peter Knoppers

Field Summary

Fields

Modifier and Type	Field and Description
static DualAccelerationStep	TOODANGEROUS Return value if lane change causes immediate collision.

Constructor Summary

Constructors

Constructor and Description
AbstractGTUFollowingModelMobil()

Method Summary

Modifier and Type	Method and Description
AccelerationStep	computeAccelerationStep(LaneBasedGTU gtu, org.djunits.value.vdouble.scalar.Speed leaderSpeed, org.djunits.value.vdouble.scalar.Length headway, org.djunits.value.vdouble.scalar.Length maxDistance, org.djunits.value.vdouble.scalar.Speed speedLimit) Compute the acceleration that would be used to follow a leader.
AccelerationStep	computeAccelerationStep(LaneBasedGTU gtu, org.djunits.value.vdouble.scalar.Speed leaderSpeed, org.djunits.value.vdouble.scalar.Length headway, org.djunits.value.vdouble.scalar.Length maxDistance, 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.
AccelerationStep	computeAccelerationStep(org.djunits.value.vdouble.scalar.Speed followerSpeed, 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.Time currentTime) Compute the acceleration that would be used to follow a leader.
AccelerationStep	computeAccelerationStep(org.djunits.value.vdouble.scalar.Speed followerSpeed, 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.Time currentTime, org.djunits.value.vdouble.scalar.Duration stepSize) Compute the acceleration that would be used to follow a leader.
AccelerationStep	computeAccelerationStepWithNoLeader(LaneBasedGTU gtu, org.djunits.value.vdouble.scalar.Length maxDistance, org.djunits.value.vdouble.scalar.Speed speedLimit) Compute the acceleration that would be used if the is not leader in sight.
AccelerationStep	computeAccelerationStepWithNoLeader(LaneBasedGTU gtu, org.djunits.value.vdouble.scalar.Length maxDistance, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Duration stepSize) Compute the acceleration that would be used if the is not leader in sight.
DualAccelerationStep	computeDualAccelerationStep(LaneBasedGTU referenceGTU, Collection<Headway> otherGTUs, org.djunits.value.vdouble.scalar.Length maxDistance, org.djunits.value.vdouble.scalar.Speed speedLimit) Compute the lowest accelerations (or most severe decelerations) that would be used if a referenceGTU is present (inserted, or not removed) in a set of other GTUs. If any GTU in the set of otherGTUs has a null headway (indicating that the other GTU is in fact parallel to the referenceGTU), prohibitive decelerations shall be returned. Two AccelerationStep values are returned in a DualAccelerationStep. or should slow down for a crossing from accelerating to unsafe speeds.
DualAccelerationStep	computeDualAccelerationStep(LaneBasedGTU referenceGTU, Collection<Headway> otherHeadways, org.djunits.value.vdouble.scalar.Length maxDistance, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Duration stepSize) Compute the lowest accelerations (or most severe decelerations) that would be used if a referenceGTU is present (inserted, or not removed) in a set of other GTUs. If any GTU in the set of otherGTUs has a null headway (indicating that the other GTU is in fact parallel to the referenceGTU), prohibitive decelerations shall be returned. Two AccelerationStep values are returned in a DualAccelerationStep. or should slow down for a crossing from accelerating to unsafe speeds.
org.djunits.value.vdouble.scalar.Length	minimumHeadway(org.djunits.value.vdouble.scalar.Speed followerSpeed, org.djunits.value.vdouble.scalar.Speed leaderSpeed, org.djunits.value.vdouble.scalar.Length precision, org.djunits.value.vdouble.scalar.Length maxDistance, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Speed followerMaximumSpeed) Compute the minimum net headway given the speed of the follower and the leader. At the returned headway, the follower would decelerate with it's maximum comfortable deceleration.

Methods inherited from class java.lang.Object

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

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

computeAcceleration, computeAcceleration, getMaximumSafeDeceleration, getStepSize, setA, setFspeed, setT

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

desiredHeadway, desiredSpeed, followingAcceleration, getLongName, getName

Field Detail

TOODANGEROUS

public static final DualAccelerationStep TOODANGEROUS

Return value if lane change causes immediate collision.

Constructor Detail

AbstractGTUFollowingModelMobil

public AbstractGTUFollowingModelMobil()

Method Detail

computeDualAccelerationStep

public final DualAccelerationStep computeDualAccelerationStep(LaneBasedGTU referenceGTU,
                                                              Collection<Headway> otherGTUs,
                                                              org.djunits.value.vdouble.scalar.Length maxDistance,
                                                              org.djunits.value.vdouble.scalar.Speed speedLimit)
                                                       throws org.opentrafficsim.core.gtu.GTUException

Compute the lowest accelerations (or most severe decelerations) that would be used if a referenceGTU is present (inserted, or not removed) in a set of other GTUs.
If any GTU in the set of otherGTUs has a null headway (indicating that the other GTU is in fact parallel to the referenceGTU), prohibitive decelerations shall be returned.
Two AccelerationStep values are returned in a DualAccelerationStep.
or should slow down for a crossing from accelerating to unsafe speeds.

Specified by:

computeDualAccelerationStep in interface GTUFollowingModelOld

Parameters:

referenceGTU - LaneBasedGTU; the GTU for which the accelerations are computed

otherGTUs - Collection<HeadwayGTU>; the other GTUs. A negative headway value indicates that the other GTU is a follower. NB. If the referenceGTU is contained in this Collection, it is ignored.

maxDistance - Length; 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:

DualAccelerationStep; the result with the lowest accelerations (or most severe decelerations) of application of the GTU following model of the referenceGTU for each leader and follower

Throws:

org.opentrafficsim.core.gtu.GTUException - when the speed of the gtu cannot be determined

computeDualAccelerationStep

public final DualAccelerationStep computeDualAccelerationStep(LaneBasedGTU referenceGTU,
                                                              Collection<Headway> otherHeadways,
                                                              org.djunits.value.vdouble.scalar.Length maxDistance,
                                                              org.djunits.value.vdouble.scalar.Speed speedLimit,
                                                              org.djunits.value.vdouble.scalar.Duration stepSize)
                                                       throws org.opentrafficsim.core.gtu.GTUException

Compute the lowest accelerations (or most severe decelerations) that would be used if a referenceGTU is present (inserted, or not removed) in a set of other GTUs.
If any GTU in the set of otherGTUs has a null headway (indicating that the other GTU is in fact parallel to the referenceGTU), prohibitive decelerations shall be returned.
Two AccelerationStep values are returned in a DualAccelerationStep.
or should slow down for a crossing from accelerating to unsafe speeds.

Specified by:

computeDualAccelerationStep in interface GTUFollowingModelOld

Parameters:

referenceGTU - LaneBasedGTU; the GTU for which the accelerations are computed

otherHeadways - Collection<HeadwayGTU>; the other GTUs. A negative headway value indicates that the other GTU is a follower. NB. If the referenceGTU is contained in this Collection, it is ignored.

maxDistance - Length; 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:

DualAccelerationStep; the result with the lowest accelerations (or most severe decelerations) of application of the GTU following model of the referenceGTU for each leader and follower

Throws:

org.opentrafficsim.core.gtu.GTUException - when the speed of the gtu cannot be determined

computeAccelerationStep

public final AccelerationStep computeAccelerationStep(LaneBasedGTU gtu,
                                                      org.djunits.value.vdouble.scalar.Speed leaderSpeed,
                                                      org.djunits.value.vdouble.scalar.Length headway,
                                                      org.djunits.value.vdouble.scalar.Length maxDistance,
                                                      org.djunits.value.vdouble.scalar.Speed speedLimit)
                                               throws org.opentrafficsim.core.gtu.GTUException

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

Specified by:

computeAccelerationStep in interface GTUFollowingModelOld

Parameters:

gtu - LaneBasedGTU; the GTU for which acceleration is computed

leaderSpeed - Speed; the speed of the leader

headway - Length; the headway of the leader

maxDistance - Length; 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:

AccelerationStep; the result of application of the GTU following model

Throws:

org.opentrafficsim.core.gtu.GTUException - when the speed of the gtu cannot be determined

computeAccelerationStep

public final AccelerationStep computeAccelerationStep(LaneBasedGTU gtu,
                                                      org.djunits.value.vdouble.scalar.Speed leaderSpeed,
                                                      org.djunits.value.vdouble.scalar.Length headway,
                                                      org.djunits.value.vdouble.scalar.Length maxDistance,
                                                      org.djunits.value.vdouble.scalar.Speed speedLimit,
                                                      org.djunits.value.vdouble.scalar.Duration stepSize)
                                               throws org.opentrafficsim.core.gtu.GTUException

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

Specified by:

computeAccelerationStep in interface GTUFollowingModelOld

Parameters:

gtu - LaneBasedGTU; the GTU for which acceleration is computed

leaderSpeed - Speed; the speed of the leader

headway - Length; the headway of the leader

maxDistance - Length; 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:

AccelerationStep; the result of application of the GTU following model

Throws:

org.opentrafficsim.core.gtu.GTUException - when the speed of the gtu cannot be determined

computeAccelerationStep

public final AccelerationStep computeAccelerationStep(org.djunits.value.vdouble.scalar.Speed followerSpeed,
                                                      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.Time currentTime)

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

Specified by:

computeAccelerationStep in interface GTUFollowingModelOld

Parameters:

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

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

currentTime - to be used to determine the validity of the AccelerationStep

Returns:

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

computeAccelerationStep

public final AccelerationStep computeAccelerationStep(org.djunits.value.vdouble.scalar.Speed followerSpeed,
                                                      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.Time currentTime,
                                                      org.djunits.value.vdouble.scalar.Duration stepSize)

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

Specified by:

computeAccelerationStep in interface GTUFollowingModelOld

Parameters:

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

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

currentTime - to be used to determine the validity of the AccelerationStep

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

computeAccelerationStepWithNoLeader

public final AccelerationStep computeAccelerationStepWithNoLeader(LaneBasedGTU gtu,
                                                                  org.djunits.value.vdouble.scalar.Length maxDistance,
                                                                  org.djunits.value.vdouble.scalar.Speed speedLimit)
                                                           throws org.opentrafficsim.core.gtu.GTUException

Compute the acceleration that would be used if the is not leader in sight.

Specified by:

computeAccelerationStepWithNoLeader in interface GTUFollowingModelOld

Parameters:

gtu - LaneBasedGTU; the GTU for which acceleration is computed

maxDistance - Length; 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:

AccelerationStep; the result of application of the GTU following model

Throws:

org.opentrafficsim.core.gtu.GTUException - when the speed of the gtu cannot be determined

computeAccelerationStepWithNoLeader

public final AccelerationStep computeAccelerationStepWithNoLeader(LaneBasedGTU gtu,
                                                                  org.djunits.value.vdouble.scalar.Length maxDistance,
                                                                  org.djunits.value.vdouble.scalar.Speed speedLimit,
                                                                  org.djunits.value.vdouble.scalar.Duration stepSize)
                                                           throws org.opentrafficsim.core.gtu.GTUException

Compute the acceleration that would be used if the is not leader in sight.

Specified by:

computeAccelerationStepWithNoLeader in interface GTUFollowingModelOld

Parameters:

gtu - LaneBasedGTU; the GTU for which acceleration is computed

maxDistance - Length; 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:

AccelerationStep; the result of application of the GTU following model

Throws:

org.opentrafficsim.core.gtu.GTUException - when the speed of the gtu cannot be determined

minimumHeadway

public final org.djunits.value.vdouble.scalar.Length minimumHeadway(org.djunits.value.vdouble.scalar.Speed followerSpeed,
                                                                    org.djunits.value.vdouble.scalar.Speed leaderSpeed,
                                                                    org.djunits.value.vdouble.scalar.Length precision,
                                                                    org.djunits.value.vdouble.scalar.Length maxDistance,
                                                                    org.djunits.value.vdouble.scalar.Speed speedLimit,
                                                                    org.djunits.value.vdouble.scalar.Speed followerMaximumSpeed)

Compute the minimum net headway given the speed of the follower and the leader.
At the returned headway, the follower would decelerate with it's maximum comfortable deceleration.

Specified by:

minimumHeadway in interface GTUFollowingModelOld

Parameters:

followerSpeed - Speed; speed of the follower

leaderSpeed - Speed; speed of the leader

precision - Length; the required precision of the result (must be > 0)

maxDistance - Length; 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

followerMaximumSpeed - Speed; the maximum speed that the follower can drive at

Returns:

Length