Package org.opentrafficsim.road.gtu.generator

Class TTCRoomChecker

java.lang.Object

org.opentrafficsim.road.gtu.generator.TTCRoomChecker

All Implemented Interfaces:

LaneBasedGTUGenerator.RoomChecker

public class TTCRoomChecker
extends Object
implements LaneBasedGTUGenerator.RoomChecker

Room checker based on time-to-collision. The room is considered ok if:

1. The headway is larger than speed*1.0s + 3m
2. time-to-collision < value

where 'value' is a given value in the constructor.

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 17 nov. 2016

Author:

Alexander Verbraeck, Peter Knoppers, Wouter Schakel

Constructor Summary

Constructors

Constructor	Description
TTCRoomChecker(Duration ttc)	Constructor.

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.
Duration	getTtc()	Returns the TTC value.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

TTCRoomChecker

public TTCRoomChecker(Duration ttc)

Constructor.

Parameters:

ttc - Duration; time to collision

Method Detail

canPlace

public final 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

getTtc

public final Duration getTtc()

Returns the TTC value.

Returns:

Duration; TTC value

toString

public final String toString()

Overrides:

toString in class Object