org.opentrafficsim.road.gtu.lane.tactical.util

Class TrafficLightUtil

java.lang.Object

org.opentrafficsim.road.gtu.lane.tactical.util.TrafficLightUtil

public final class TrafficLightUtil
extends Object

Static methods regarding traffic lights for composition in tactical planners.

Copyright (c) 2013-2018 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 May 13, 2016

Author:

Wouter Schakel

Field Summary

Fields

Modifier and Type	Field and Description
static ParameterTypeAcceleration	B_YELLOW Maximum deceleration for stopping for yellow traffic light.

Method Summary

Modifier and Type	Method and Description
static Acceleration	respondToTrafficLight(Parameters parameters, HeadwayTrafficLight headwayTrafficLight, CarFollowingModel carFollowingModel, Speed speed, SpeedLimitInfo speedLimitInfo) Returns an acceleration as response to a traffic light, being positive infinity if ignored.
static Acceleration	respondToTrafficLights(Parameters parameters, Iterable<HeadwayTrafficLight> headwayTrafficLights, CarFollowingModel carFollowingModel, Speed speed, SpeedLimitInfo speedLimitInfo) Returns an acceleration as response to a set of traffic lights, being positive infinity if ignored.

Methods inherited from class java.lang.Object

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

Field Detail

B_YELLOW

public static final ParameterTypeAcceleration B_YELLOW

Maximum deceleration for stopping for yellow traffic light.

Method Detail

respondToTrafficLights

public static Acceleration respondToTrafficLights(Parameters parameters,
                                                  Iterable<HeadwayTrafficLight> headwayTrafficLights,
                                                  CarFollowingModel carFollowingModel,
                                                  Speed speed,
                                                  SpeedLimitInfo speedLimitInfo)
                                           throws ParameterException

Returns an acceleration as response to a set of traffic lights, being positive infinity if ignored. The response is governed by the car-following model in case a traffic light is yellow or red. A constant deceleration to stop is also calculated, and the highest acceleration of both is used. If this value is below -bYellow (B_YELLOW), the traffic light is ignored, which usually occurs only during the yellow phase. By using the highest acceleration of the car-following model and the constant deceleration, it is ensured that comfortable deceleration is applied if approaching a red traffic light from far away, while strong deceleration is only applied if required and appropriately represents stopping for yellow.

Parameters:

parameters - parameters

headwayTrafficLights - set of headway traffic lights

carFollowingModel - car following model

speed - speed

speedLimitInfo - speed limit info

Returns:

acceleration as response to a traffic light, being positive infinity if ignored

Throws:

ParameterException - if a parameter is not defined

NullPointerException - if any input is null

IllegalArgumentException - if the traffic light is not downstream

respondToTrafficLight

public static Acceleration respondToTrafficLight(Parameters parameters,
                                                 HeadwayTrafficLight headwayTrafficLight,
                                                 CarFollowingModel carFollowingModel,
                                                 Speed speed,
                                                 SpeedLimitInfo speedLimitInfo)
                                          throws ParameterException

Returns an acceleration as response to a traffic light, being positive infinity if ignored. The response is governed by the car-following model in case the traffic light is yellow or red. A constant deceleration to stop is also calculated, and the highest acceleration of both is used. If this value is below -bYellow (B_YELLOW), the traffic light is ignored, which usually occurs only during the yellow phase. By using the highest acceleration of the car-following model and the constant deceleration, it is ensured that comfortable deceleration is applied if approaching a red traffic light from far away, while strong deceleration is only applied if required and appropriately represents stopping for yellow.

Parameters:

parameters - parameters

headwayTrafficLight - headway traffic light

carFollowingModel - car following model

speed - speed

speedLimitInfo - speed limit info

Returns:

acceleration as response to a traffic light, being positive infinity if ignored

Throws:

ParameterException - if a parameter is not defined

NullPointerException - if any input is null

IllegalArgumentException - if the traffic light is not downstream