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

Class IDMOld

java.lang.Object

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

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

All Implemented Interfaces:

GTUFollowingModelOld

public class IDMOld
extends AbstractGTUFollowingModelMobil

The Intelligent Driver Model by Treiber, Hennecke and Helbing.

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: 1408 $, $LastChangedDate: 2015-09-24 15:17:25 +0200 (Thu, 24 Sep 2015) $, by $Author: pknoppers $, initial version 19 nov. 2014

Author:

Peter Knoppers

Field Summary

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

TOODANGEROUS

Constructor Summary

Constructors

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

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, toString, wait, wait, wait

Constructor Detail

IDMOld

public IDMOld()

Construct a new IDM car following model with reasonable values (reasonable for passenger cars).

IDMOld

public IDMOld(org.djunits.value.vdouble.scalar.Acceleration a,
              org.djunits.value.vdouble.scalar.Acceleration b,
              org.djunits.value.vdouble.scalar.Length.Rel s0,
              org.djunits.value.vdouble.scalar.Time.Rel tSafe,
              double delta)

Construct a new IDM 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). Normal value is 1.5 m/s/s.

s0 - Length.Rel; the minimum stationary headway (normal value is 2 m)

tSafe - Time.Rel; the minimum time-headway (normal value is 1s)

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.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

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.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

getStepSize

public final 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

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.

Returns:

Acceleration; must be a positive value!

getName

public final String getName()

Return the name of this GTU following model.

Returns:

String; just the name of the GTU following model

getLongName

public final 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