Package org.opentrafficsim.road.gtu

Enum Class LaneBookkeeping

java.lang.Object

java.lang.Enum<LaneBookkeeping>

org.opentrafficsim.road.gtu.LaneBookkeeping

All Implemented Interfaces:

Serializable, Comparable<LaneBookkeeping>, Constable

public enum LaneBookkeeping
extends Enum<LaneBookkeeping>

Different methods of dealing with lane bookkeeping when changing lane.

Copyright (c) 2024-2026 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

Author:

Wouter Schakel

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
EDGE	Bookkeeping changes when the reference point of the GTU enters the adjacent lane.
EDGE_INFORMED	The same as EDGE, but lateral crossing of an edge is only checked if something informs the bookkeeping that the GTU is changing lanes.
INSTANT	Instantaneous lane changes.
START	Bookkeeping changes at the start of a lane change.
START_AND_EDGE	The same as EDGE, but START is used when the speed drops below a low threshold.
START_AND_EDGE_INFORMED	Combines functions of START_AND_EDGE and EDGE_INFORMED.

Field Summary

Fields

Modifier and Type	Field	Description
static final org.djunits.value.vdouble.scalar.Speed	START_THRESHOLD	Threshold speed below which START is used in START_AND_EDGE.

Method Summary

Modifier and Type	Method	Description
boolean	isEdge()	Whether the lane bookkeeping is any type that contains edge-based logic.
boolean	isInformed()	Whether the bookkeeping is informed by an outside source, such as a model, that a lane change is occurring.
boolean	isStartAndEdge()	Whether this is start-based lane bookkeeping below the start threshold, and edge-based lane bookkeeping otherwise.
static LaneBookkeeping	valueOf(String name)	Returns the enum constant of this class with the specified name.
static LaneBookkeeping[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

INSTANT

public static final LaneBookkeeping INSTANT

Instantaneous lane changes. GTUs make a lateral jump. This is advised for scientific output as models are not well developed regarding lane change movement, lane change cancellation, the leader in the start lane (particularly at low speed), and how potential followers respond.

START

public static final LaneBookkeeping START

Bookkeeping changes at the start of a lane change. The GTU has to make the lateral move with possible GTU overlap in the from lane. Trajectories are instantaneously recorded in the target lane.

EDGE

public static final LaneBookkeeping EDGE

Bookkeeping changes when the reference point of the GTU enters the adjacent lane. Due to model limitations this can create dead-locks and severe decelerations at low speed in dense traffic. This is advised for control of vehicles in driver simulators due to the full continuous movement without overlap between GTUs.

START_AND_EDGE

public static final LaneBookkeeping START_AND_EDGE

The same as EDGE, but START is used when the speed drops below a low threshold. This prevents dead-locks and severe decelerations, but allows GTU overlap in the from lane at low speeds. This is advised for microscopic simulations with visual purposes. Using START only at low speeds makes the trajectories more correlated to the movement.

EDGE_INFORMED

public static final LaneBookkeeping EDGE_INFORMED

The same as EDGE, but lateral crossing of an edge is only checked if something informs the bookkeeping that the GTU is changing lanes. This can for example be done by a model. In this way a model can prevent lane bookkeeping errors that its own limited modeling could produce. For example when canceling a lane change due to an adjacent GTU but still curving over the edge.

START_AND_EDGE_INFORMED

public static final LaneBookkeeping START_AND_EDGE_INFORMED

Combines functions of START_AND_EDGE and EDGE_INFORMED.

Field Details

START_THRESHOLD

public static final org.djunits.value.vdouble.scalar.Speed START_THRESHOLD

Threshold speed below which START is used in START_AND_EDGE.

Method Details

values

public static LaneBookkeeping[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static LaneBookkeeping valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null

isEdge

public boolean isEdge()

Whether the lane bookkeeping is any type that contains edge-based logic.

Returns:

whether the lane bookkeeping is any type that contains edge-based logic

isStartAndEdge

public boolean isStartAndEdge()

Whether this is start-based lane bookkeeping below the start threshold, and edge-based lane bookkeeping otherwise.

Returns:

whether this is start-based lane bookkeeping below the start threshold, and edge-based lane bookkeeping otherwise

isInformed

public boolean isInformed()

Whether the bookkeeping is informed by an outside source, such as a model, that a lane change is occurring.

Returns:

whether the bookkeeping is informed by an outside source, such as a model, that a lane change is occurring