org.opentrafficsim.road.gtu.lane.perception

Class HeadwayGTU

java.lang.Object

org.opentrafficsim.road.gtu.lane.perception.AbstractHeadway

org.opentrafficsim.road.gtu.lane.perception.HeadwayGTU

All Implemented Interfaces:

Serializable, Comparable<Headway>, org.opentrafficsim.core.perception.PerceivedObject, Headway

public class HeadwayGTU
extends AbstractHeadway

Container for a reference to information about a (lane based) GTU and a headway. The Headway can store information about GTUs or objects ahead of the reference GTU, behind the reference GTU, or (partially) parallel to the reference GTU. In addition to the (perceived) headway, several other pieces of information can be stored, such as (perceived) speed, (perceived) acceleration, (perceived) turn indicators, and (perceived) braking lights.
Special care must be taken in curves when perceiving headway of a GTU or object on an adjacent lane.The question is whether we perceive the parallel or ahead/behind based on a line perpendicular to the front/back of the GTU (rectangular), or perpendicular to the center line of the lane (wedge-shaped in case of a curve). The difficulty of a wedge-shaped situation is that reciprocity might be violated: in case of a clothoid, for instance, it is not sure that the point on the center line when projected from lane 1 to lane 2 is the same as the projection from lane 2 to lane 1. The same holds for shapes with sharp bends. Therefore, algorithms implementing headway should only project the reference point of the reference GTU on the center line of the adjacent lane, and then calculate the forward position and backward position on the adjacent lane based on the reference point. Still, our human perception of what is parallel and what not, is not reflected by fractional positions. See examples in http://simulation.tudelft.nl:8085/browse/OTS-113.

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: 1368 $, $LastChangedDate: 2015-09-02 00:20:20 +0200 (Wed, 02 Sep 2015) $, by $Author: averbraeck $, initial version 11 feb. 2015

Author:

Alexander Verbraeck, Peter Knoppers

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	HeadwayGTU.GTUStatus Observable characteristics of a GTU.

Nested classes/interfaces inherited from interface org.opentrafficsim.road.gtu.lane.perception.Headway

Headway.ObjectType

Constructor Summary

Constructors

Constructor and Description
HeadwayGTU(String id, org.opentrafficsim.core.gtu.GTUType gtuType, org.djunits.value.vdouble.scalar.Length distance) Construct a new Headway information object, for a non-moving GTU ahead of us or behind us.
HeadwayGTU(String id, org.opentrafficsim.core.gtu.GTUType gtuType, org.djunits.value.vdouble.scalar.Length overlapFront, org.djunits.value.vdouble.scalar.Length overlap, org.djunits.value.vdouble.scalar.Length overlapRear) Construct a new Headway information object, for a non-moving GTU parallel with us.
HeadwayGTU(String id, org.opentrafficsim.core.gtu.GTUType gtuType, org.djunits.value.vdouble.scalar.Length overlapFront, org.djunits.value.vdouble.scalar.Length overlap, org.djunits.value.vdouble.scalar.Length overlapRear, org.djunits.value.vdouble.scalar.Speed speed, org.djunits.value.vdouble.scalar.Acceleration acceleration) Construct a new Headway information object, for a moving GTU parallel with us.
HeadwayGTU(String id, org.opentrafficsim.core.gtu.GTUType gtuType, org.djunits.value.vdouble.scalar.Length distance, org.djunits.value.vdouble.scalar.Speed speed, org.djunits.value.vdouble.scalar.Acceleration acceleration, HeadwayGTU.GTUStatus... gtuStatus) Construct a new Headway information object, for a moving GTU ahead of us or behind us.

Method Summary

Modifier and Type	Method and Description
org.opentrafficsim.core.gtu.GTUType	getGtuType()
boolean	isBrakingLightsOn()
boolean	isEmergencyLightsOn()
boolean	isHonking()
boolean	isLeftTurnIndicatorOn()
boolean	isRightTurnIndicatorOn()
String	toString()

Methods inherited from class org.opentrafficsim.road.gtu.lane.perception.AbstractHeadway

equals, getAcceleration, getDistance, getId, getObjectType, getOverlap, getOverlapFront, getOverlapRear, getSpeed, hashCode, isAhead, isBehind, isParallel

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.opentrafficsim.road.gtu.lane.perception.Headway

compareTo

Constructor Detail

HeadwayGTU

public HeadwayGTU(String id,
                  org.opentrafficsim.core.gtu.GTUType gtuType,
                  org.djunits.value.vdouble.scalar.Length distance,
                  org.djunits.value.vdouble.scalar.Speed speed,
                  org.djunits.value.vdouble.scalar.Acceleration acceleration,
                  HeadwayGTU.GTUStatus... gtuStatus)
           throws org.opentrafficsim.core.gtu.GTUException

Construct a new Headway information object, for a moving GTU ahead of us or behind us.

Parameters:

id - the id of the GTU for comparison purposes, can not be null.

gtuType - the perceived GTU Type, or null if unknown.

distance - the distance to the other object; if this constructor is used, distance cannot be null.

speed - the (perceived) speed of the other object; can be null if unknown.

acceleration - the (perceived) acceleration of the other object; can be null if unknown.

gtuStatus - the observable characteristics of the GTU.

Throws:

org.opentrafficsim.core.gtu.GTUException - when id is null, objectType is null, or parameters are inconsistent

HeadwayGTU

public HeadwayGTU(String id,
                  org.opentrafficsim.core.gtu.GTUType gtuType,
                  org.djunits.value.vdouble.scalar.Length distance)
           throws org.opentrafficsim.core.gtu.GTUException

Construct a new Headway information object, for a non-moving GTU ahead of us or behind us.

Parameters:

id - String; the id of the GTU for comparison purposes, can not be null.

gtuType - GTUType; the perceived GTU Type, or null if unknown.

distance - Length; the distance to the other GTU; if this constructor is used, distance cannot be null.

Throws:

org.opentrafficsim.core.gtu.GTUException - when id is null, or parameters are inconsistent

HeadwayGTU

public HeadwayGTU(String id,
                  org.opentrafficsim.core.gtu.GTUType gtuType,
                  org.djunits.value.vdouble.scalar.Length overlapFront,
                  org.djunits.value.vdouble.scalar.Length overlap,
                  org.djunits.value.vdouble.scalar.Length overlapRear,
                  org.djunits.value.vdouble.scalar.Speed speed,
                  org.djunits.value.vdouble.scalar.Acceleration acceleration)
           throws org.opentrafficsim.core.gtu.GTUException

Construct a new Headway information object, for a moving GTU parallel with us.

Parameters:

id - the id of the GTU for comparison purposes, can not be null.

gtuType - the perceived GTU Type, or null if unknown.

overlapFront - the front-front distance to the other GTU; if this constructor is used, this value cannot be null.

overlap - the 'center' overlap with the other GTU; if this constructor is used, this value cannot be null.

overlapRear - the rear-rear distance to the other GTU; if this constructor is used, this value cannot be null.

speed - the (perceived) speed of the other GTU; can be null if unknown.

acceleration - the (perceived) acceleration of the other GTU; can be null if unknown.

Throws:

org.opentrafficsim.core.gtu.GTUException - when id is null, or parameters are inconsistent

HeadwayGTU

public HeadwayGTU(String id,
                  org.opentrafficsim.core.gtu.GTUType gtuType,
                  org.djunits.value.vdouble.scalar.Length overlapFront,
                  org.djunits.value.vdouble.scalar.Length overlap,
                  org.djunits.value.vdouble.scalar.Length overlapRear)
           throws org.opentrafficsim.core.gtu.GTUException

Construct a new Headway information object, for a non-moving GTU parallel with us.

Parameters:

id - the id of the GTU for comparison purposes, can not be null.

gtuType - the perceived GTU Type, or null if unknown.

overlapFront - the front-front distance to the other GTU; if this constructor is used, this value cannot be null.

overlap - the 'center' overlap with the other GTU; if this constructor is used, this value cannot be null.

overlapRear - the rear-rear distance to the other GTU; if this constructor is used, this value cannot be null.

Throws:

org.opentrafficsim.core.gtu.GTUException - when id is null, or parameters are inconsistent

Method Detail

getGtuType

public final org.opentrafficsim.core.gtu.GTUType getGtuType()

Returns:

gtuType

isBrakingLightsOn

public final boolean isBrakingLightsOn()

Returns:

were the braking lights on?

isLeftTurnIndicatorOn

public final boolean isLeftTurnIndicatorOn()

Returns:

was the left turn indicator on?

isRightTurnIndicatorOn

public final boolean isRightTurnIndicatorOn()

Returns:

was the right turn indicator on?

isEmergencyLightsOn

public final boolean isEmergencyLightsOn()

Returns:

were the emergency lights on?

isHonking

public final boolean isHonking()

Returns:

was the vehicle honking or ringing its bell when being observed for the headway?

toString

public final String toString()

Overrides:

toString in class AbstractHeadway