Package org.opentrafficsim.road.gtu.generator

Class CFRoomChecker

java.lang.Object

org.opentrafficsim.road.gtu.generator.CFRoomChecker

All Implemented Interfaces:

LaneBasedGTUGenerator.RoomChecker

Direct Known Subclasses:

CFBARoomChecker

public class CFRoomChecker
extends Object
implements LaneBasedGTUGenerator.RoomChecker

This class places GTU's behind the leader at the desired headway (i.e. CF, car-following) and the speed of the leader, but no further than the GTU could have traveled at the desired speed during the time since the desired arrival. With multiple leaders, the leader that causes the most upstream following position is used.

Copyright (c) 2013-2020 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

Version:

$Revision$, $LastChangedDate$, by $Author$, initial version 12 jan. 2018

Author:

Alexander Verbraeck, Peter Knoppers, Wouter Schakel

Constructor Summary

Constructors

Constructor	Description
CFRoomChecker()

Method Summary

Modifier and Type	Method	Description
LaneBasedGTUGenerator.Placement	canPlace(SortedSet<HeadwayGTU> leaders, LaneBasedGTUCharacteristics characteristics, Duration since, Set<DirectedLanePosition> initialPosition)	Return the maximum safe speed and position for a new GTU with the specified characteristics.
protected double	headwayFactor(Speed desiredSpeed, Length desiredHeadway, Speed generationSpeed, Length generationHeadway, Length leaderLength)	Returns a situation dependent headway factor to deal with spillback.

Methods inherited from class java.lang.Object

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

Constructor Detail

CFRoomChecker

public CFRoomChecker()

Method Detail

canPlace

public LaneBasedGTUGenerator.Placement canPlace(SortedSet<HeadwayGTU> leaders,
                                                LaneBasedGTUCharacteristics characteristics,
                                                Duration since,
                                                Set<DirectedLanePosition> initialPosition)
                                         throws NetworkException,
                                                GTUException

Return the maximum safe speed and position for a new GTU with the specified characteristics. Returns Placement.NO if there is no safe speed and position. This method might be called with an empty leader set such that the desired speed can be implemented.

Specified by:

canPlace in interface LaneBasedGTUGenerator.RoomChecker

Parameters:

leaders - SortedSet<HeadwayGTU>; leaders, usually 1, possibly more after a branch

characteristics - LaneBasedGTUCharacteristics; characteristics of the proposed new GTU

since - Duration; time since the GTU wanted to arrive

initialPosition - Set<DirectedLanePosition>; initial position

Returns:

Speed; maximum safe speed, or null if a GTU with the specified characteristics cannot be placed at the current time

Throws:

NetworkException - this method may throw a NetworkException if it encounters an error in the network structure

GTUException - on parameter exception

headwayFactor

protected double headwayFactor(Speed desiredSpeed,
                               Length desiredHeadway,
                               Speed generationSpeed,
                               Length generationHeadway,
                               Length leaderLength)

Returns a situation dependent headway factor to deal with spillback.

Parameters:

desiredSpeed - Speed; desired speed

desiredHeadway - Length; desired headway at desired speed

generationSpeed - Speed; generation speed

generationHeadway - Length; desired headway at generation speed

leaderLength - Length; length of the leader

Returns:

situation dependent headway factor to deal with spillback