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

Interface GTUFollowingModelOld

All Known Implementing Classes:

AbstractCarFollowingModel, AbstractGTUFollowingModelMobil, FixedAccelerationModel, IDM, IDMOld, IDMPlus, IDMPlusOld, SequentialFixedAccelerationModel

public interface GTUFollowingModelOld

GTU following model interface.
GTU following models following this interface compute an acceleration.

Copyright (c) 2013-2015 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

Version:

$Revision: 1401 $, $LastChangedDate: 2015-09-14 01:33:02 +0200 (Mon, 14 Sep 2015) $, by $Author: averbraeck $, initial version Jul 2, 2014

Author:

Alexander Verbraeck, Peter Knoppers

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.Rel 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.Rel headway, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Time.Rel stepSize) 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.Rel headway, org.djunits.value.vdouble.scalar.Length.Rel 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.Rel headway, org.djunits.value.vdouble.scalar.Length.Rel maxDistance, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Time.Rel 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.Rel headway, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Time.Abs 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.Rel headway, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Time.Abs currentTime, org.djunits.value.vdouble.scalar.Time.Rel stepSize) Compute the acceleration that would be used to follow a leader.
AccelerationStep	computeAccelerationStepWithNoLeader(LaneBasedGTU gtu, org.djunits.value.vdouble.scalar.Length.Rel 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.Rel maxDistance, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Time.Rel stepSize) Compute the acceleration that would be used if the is not leader in sight.
DualAccelerationStep	computeDualAccelerationStep(LaneBasedGTU gtu, Collection<HeadwayGTU> otherGtuHeadways, org.djunits.value.vdouble.scalar.Length.Rel 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 gtu, Collection<HeadwayGTU> otherGtuHeadways, org.djunits.value.vdouble.scalar.Length.Rel maxDistance, org.djunits.value.vdouble.scalar.Speed speedLimit, org.djunits.value.vdouble.scalar.Time.Rel 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.
String	getLongName() Return complete textual information about this instantiation of this GTU 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 this GTU following model.
org.djunits.value.vdouble.scalar.Time.Rel	getStepSize() Return the standard step size of this GTU following model.
org.djunits.value.vdouble.scalar.Length.Rel	minimumHeadway(org.djunits.value.vdouble.scalar.Speed followerSpeed, org.djunits.value.vdouble.scalar.Speed leaderSpeed, org.djunits.value.vdouble.scalar.Length.Rel precision, org.djunits.value.vdouble.scalar.Length.Rel 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.

Method Detail

computeAccelerationStep

AccelerationStep computeAccelerationStep(LaneBasedGTU gtu,
                                         org.djunits.value.vdouble.scalar.Speed leaderSpeed,
                                         org.djunits.value.vdouble.scalar.Length.Rel headway,
                                         org.djunits.value.vdouble.scalar.Length.Rel 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.

Parameters:

gtu - LaneBasedGTU; the GTU for which acceleration is computed

leaderSpeed - Speed; the speed of the leader

headway - Length.Rel; the headway of the leader

maxDistance - Length.Rel; 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 velocity of the gtu cannot be determined

computeAccelerationStep

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

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

Parameters:

gtu - LaneBasedGTU; the GTU for which acceleration is computed

leaderSpeed - Speed; the speed of the leader

headway - Length.Rel; the headway of the leader

maxDistance - Length.Rel; 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 velocity of the gtu cannot be determined

computeAcceleration

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.Rel headway,
                                                                  org.djunits.value.vdouble.scalar.Speed speedLimit)

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

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.Rel; 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

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.Rel headway,
                                                                  org.djunits.value.vdouble.scalar.Speed speedLimit,
                                                                  org.djunits.value.vdouble.scalar.Time.Rel stepSize)

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

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.Rel; 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

computeAccelerationStep

AccelerationStep computeAccelerationStep(org.djunits.value.vdouble.scalar.Speed followerSpeed,
                                         org.djunits.value.vdouble.scalar.Speed leaderSpeed,
                                         org.djunits.value.vdouble.scalar.Length.Rel headway,
                                         org.djunits.value.vdouble.scalar.Speed speedLimit,
                                         org.djunits.value.vdouble.scalar.Time.Abs currentTime)

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

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.Rel; 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

AccelerationStep computeAccelerationStep(org.djunits.value.vdouble.scalar.Speed followerSpeed,
                                         org.djunits.value.vdouble.scalar.Speed leaderSpeed,
                                         org.djunits.value.vdouble.scalar.Length.Rel headway,
                                         org.djunits.value.vdouble.scalar.Speed speedLimit,
                                         org.djunits.value.vdouble.scalar.Time.Abs currentTime,
                                         org.djunits.value.vdouble.scalar.Time.Rel stepSize)

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

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.Rel; 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

computeDualAccelerationStep

DualAccelerationStep computeDualAccelerationStep(LaneBasedGTU gtu,
                                                 Collection<HeadwayGTU> otherGtuHeadways,
                                                 org.djunits.value.vdouble.scalar.Length.Rel 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.

Parameters:

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

otherGtuHeadways - 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.Rel; 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 velocity of the gtu cannot be determined

computeDualAccelerationStep

DualAccelerationStep computeDualAccelerationStep(LaneBasedGTU gtu,
                                                 Collection<HeadwayGTU> otherGtuHeadways,
                                                 org.djunits.value.vdouble.scalar.Length.Rel maxDistance,
                                                 org.djunits.value.vdouble.scalar.Speed speedLimit,
                                                 org.djunits.value.vdouble.scalar.Time.Rel 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.

Parameters:

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

otherGtuHeadways - 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.Rel; 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 velocity of the gtu cannot be determined

computeAccelerationStepWithNoLeader

AccelerationStep computeAccelerationStepWithNoLeader(LaneBasedGTU gtu,
                                                     org.djunits.value.vdouble.scalar.Length.Rel 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.

Parameters:

gtu - LaneBasedGTU; the GTU for which acceleration is computed

maxDistance - Length.Rel; 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 velocity of the gtu cannot be determined

computeAccelerationStepWithNoLeader

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

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

Parameters:

gtu - LaneBasedGTU; the GTU for which acceleration is computed

maxDistance - Length.Rel; 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 velocity of the gtu cannot be determined

minimumHeadway

org.djunits.value.vdouble.scalar.Length.Rel minimumHeadway(org.djunits.value.vdouble.scalar.Speed followerSpeed,
                                                           org.djunits.value.vdouble.scalar.Speed leaderSpeed,
                                                           org.djunits.value.vdouble.scalar.Length.Rel precision,
                                                           org.djunits.value.vdouble.scalar.Length.Rel 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.

Parameters:

followerSpeed - Speed; speed of the follower

leaderSpeed - Speed; speed of the leader

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

maxDistance - Length.Rel; 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.Rel

getMaximumSafeDeceleration

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.

Returns:

Acceleration; must be a positive value!

getStepSize

org.djunits.value.vdouble.scalar.Time.Rel getStepSize()

Return the standard step size of this GTU following model.

Returns:

Time.Rel; the standard step size of the GTU following model

getName

String getName()

Return the name of this GTU following model.

Returns:

String; just the name of the GTU following model

getLongName

String getLongName()

Return complete textual information about this instantiation of this GTU following model.

Returns:

String; the name and parameter values of the GTU following model