EP0805427A1 - Portable casing to inform bus network users about waiting times at network busstops - Google Patents

Abstract

Portable box (10) informs user of a bus network of waiting times at the stops on the network. The device (10) includes a radio receiver (11,12) to receive information from a central management station which is updated from the buses themselves. Such information is used to determine the waiting time by a central processing unit (15). A screen (16) and keyboard (17) provides means for inputting questions and reading information. A bell (19) is provided which is used by the central processing unit to emit a warning as soon as the expected time of arrival as previously notified to the user changes significantly from the actual, new, time of arrival.

Description

The invention relates to portable boxes for informing the users of a bus network on the waiting times at the stops of this network, or at least on the waiting times at at least one stop on at least one bus routes belonging to this network.

The word "bus" here designates not only the buses themselves, but also similar vehicles of urban surface public transport which are subjected to the vagaries of the urban automobile traffic in the same way as the vehicles of the private individuals.

• des moyens de réception radio pour recevoir par voie hertzienne des données permettant de connaître les temps d'attente susmentionnés,
• des moyens d'interrogation actionnables par un usager pour accéder à des informations d'attente destinées à renseigner cet usager au moins sur le temps d'attente d'un certain autobus à l'arrêt considéré sur le parcours considéré, ces informations d'attente correspondant à un certain instant d'arrivée prévu de l'autobus considéré à l'arrêt considéré,
• et des moyens d'interface commandés par une unité centrale électronique pour communiquer lesdites informations d'attente à l'usager.

Among the portable cases of the aforementioned type, the invention relates more particularly to those which comprise:

• radio reception means for receiving over the air data enabling the abovementioned waiting times to be known,
• interrogation means operable by a user to access waiting information intended to inform this user at least about the waiting time of a certain bus at the stop considered on the route considered, this waiting information corresponding to a certain scheduled time of arrival of the bus in question at the stop in question,
• and interface means controlled by an electronic central unit for communicating said waiting information to the user.

Document WO-A-94/02923 describes an example of such a portable box.

This portable box works satisfactorily, as long as the bus drivers have a regular driving, influenced only by the conditions of the urban traffic.

But from time to time, it happens that a driver of a bus which initially had a calm and careful driving, suddenly starts to have a fast driving, or conversely that a driver who initially had a fast driving starts suddenly to have a slow driving, and this regardless of traffic conditions.

Such abrupt and unpredictable changes in conduct on the part of a bus driver render obsolete the previous predictions of the portable unit as to the expected time of arrival for the bus at a given stop.

Thus, when a bus driver suddenly switches from slow driving to fast driving, he will arrive at his next stop before the arrival time which was foreseeable when he drove slowly.

A user who has consulted his portable box while the driver is driving slowly will therefore report to the bus stop at the time of arrival initially planned, that is to say after the actual arrival of the bus. , so that this user may then miss the bus.

Conversely, if the driver has suddenly changed from fast driving to slow driving, the bus will arrive at its next stop after the arrival time which was initially foreseeable while the driver was driving fast.

Thus, a user who would have consulted his portable box while the driver was driving quickly will arrive at the bus stop at the time of arrival initially scheduled for the bus, and will have to wait unnecessarily at this stop.

The present invention aims in particular to overcome these drawbacks.

• mémoriser au moins des données représentatives de l'instant d'arrivée H0 initialement prévu pour l'autobus considéré à l'arrêt considéré sur le parcours considéré, cet instant H0 correspondant aux informations d'attente communiquées à l'usager lors de la dernière interrogation du boîtier par cet usager,
• à partir des données reçues par les moyens de réception radio, prendre en compte cycliquement des données représentatives d'un instant d'arrivée actualisé H prévu pour l'autobus considéré à l'arrêt considéré sur le parcours considéré,
• et actionner les moyens de signalisation quand les instants d'arrivée H et H0 diffèrent d'une durée AH supérieure à une certaine limite.

According to the invention, a portable box of the kind in question is essentially characterized in that it further comprises signaling means capable of attracting the attention of the user, and in that the central unit is adapted for:

• memorize at least data representative of the instant of arrival H0 initially planned for the bus considered at the stop considered on the route considered, this instant H0 corresponding to the waiting information communicated to the user during the last interrogation of the box by this user,
• from the data received by the radio reception means, cyclically take into account data representative of an updated arrival time H provided for the bus considered at the stop considered on the route considered,
• and actuate the signaling means when the arrival times H and H0 differ by a duration AH greater than a certain limit.

Thanks to these provisions, if the waiting time and / or the time of arrival of the next bus, which were initially estimated and communicated to the user, turns out to be vitiated by a substantial error, then this user is warned that he must consult the portable unit again to find out the currently estimated waiting time and / or arrival time for the next bus.

• le boîtier portatif est adapté pour informer les usagers sur les temps d'attente à plusieurs arrêts, les moyens d'interrogation étant prévus pour permettre à l'usager de sélectionner un arrêt particulier sur un parcours d'autobus appartenant au réseau, l'unité centrale étant alors conçue pour renseigner l'usager au moins sur le temps d'attente de l'autobus considéré à l'arrêt sélectionné sur le parcours sélectionné, et l'unité centrale étant adaptée pour mémoriser au moins le dernier arrêt sélectionné par l'usager lors de sa dernière interrogation ainsi que le parcours d'autobus correspondant, les instants d'arrivée H0 et H étant relatifs audit arrêt sélectionné ;
• ladite limite correspond à une durée prédéterminée ;
• ladite limite correspond à une fraction du temps qui reste à courir jusqu'à l'instant d'arrivée H0 initialement prévu ;
• ladite limite est différente suivant que l'instant d'arrivée actualisé H est antérieur ou postérieur à l'instant d'arrivée H0 initialement prévu ;
• ladite limite est constituée par :
  • . une fraction du temps qui reste à courir jusqu'à l'instant d'arrivée H0 initialement prévu, si ce temps restant à courir est supérieur à une première durée prédéterminée ou si l'instant d'arrivée actualisé H est postérieur à l'instant d'arrivée H0 initialement prévu,
  • . et une deuxième durée prédéterminée lorsque le temps restant à courir jusqu'à l'instant d'arrivée H0 initialement prévu est inférieur à la première durée prédéterminée et que l'instant d'arrivée actualisé H est antérieur à l'instant d'arrivée H0 initialement prévu ;
• les moyens de signalisation sont adaptés pour émettre un signal sonore audible ;
• les moyens de signalisation sont adaptés pour émettre plusieurs signaux différents, l'unité centrale étant conçue pour faire émettre par les moyens de signalisation des signaux distincts suivant que l'instant d'arrivée actualisé H est antérieur ou postérieur à l'instant d'arrivée H0 initialement prévu ;
• les moyens de signalisation sont adaptés pour émettre plusieurs signaux différents, l'unité centrale étant conçue pour faire émettre des signaux distincts par les moyens de signalisation suivant que la durée ΔH dépasse plus ou moins la limite susmentionnée à partir de laquelle une signalisation est déclenchée ;
• les moyens d'interface sont des moyens d'affichage, et l'unité centrale est conçue pour faire afficher par les moyens d'affichage des informations d'attente correspondant à l'arrêt considéré sur le parcours considéré, dès lors que ladite unité centrale actionne les moyens de signalisation ;
• l'autobus considéré est le prochain autobus devant arriver à l'arrêt considéré sur le parcours d'autobus considéré.

In preferred embodiments, one can optionally have recourse to one and / or the other of the following arrangements:

• the portable unit is adapted to inform users about the waiting times at several stops, the interrogation means being provided to allow the user to select a particular stop on a bus route belonging to the network, the unit central unit then being designed to inform the user at least of the waiting time of the bus considered at the selected stop on the selected route, and the central unit being adapted to memorize at least the last stop selected by the user during his last interrogation as well as the corresponding bus route, the arrival times H0 and H being relative to said selected stop;
• said limit corresponds to a predetermined duration ;
• said limit corresponds to a fraction of the time remaining to run until the arrival time H0 initially planned;
• said limit is different depending on whether the updated arrival time H is before or after the arrival time H0 initially planned;
• said limit consists of:
  • . a fraction of the time remaining until the arrival time H0 initially planned, if this remaining time is greater than a first predetermined duration or if the updated arrival time H is later than the time arrival H0 initially planned,
  • . and a second predetermined duration when the time remaining until the initially scheduled arrival time H0 is less than the first predetermined duration and the updated arrival time H is earlier than the arrival time H0 initially predicted ;
• the signaling means are adapted to emit an audible audible signal;
• the signaling means are adapted to transmit several different signals, the central unit being designed to cause the signaling means to transmit distinct signals depending on whether the updated arrival time H is before or after the arrival time H0 initially planned;
• the signaling means are adapted to transmit several different signals, the central unit being designed to cause distinct signals to be transmitted by the signaling means depending on whether the duration ΔH more or less exceeds the aforementioned limit from which a signaling is triggered;
• the interface means are display means, and the central unit is designed to display waiting information corresponding to the stop considered on the route in question by the display means. that said central unit actuates the signaling means;
• the bus in question is the next bus to arrive at the stop in question on the bus route in question.

Other characteristics and advantages of the invention will appear during the following detailed description of one of its embodiments, given by way of nonlimiting example, with reference to the accompanying drawings.

• la figure 1 est une vue schématique d'une ligne d'un réseau d'autobus,
• la figure 2 est une vue schématique d'un arrêt de cette ligne d'autobus,
• et la figure 3 est un schéma de principe d'un boîtier portatif selon une forme de réalisation de l'invention.

In the drawings:

• FIG. 1 is a schematic view of a line of a bus network,
• FIG. 2 is a schematic view of a stop of this bus line,
• and Figure 3 is a block diagram of a portable housing according to one embodiment of the invention.

FIG. 1 schematically shows a line 1 of buses belonging to an urban network, traversed by buses 2 which are represented here by small triangles oriented in the direction of their progression.

Line 1 is divided into two routes (i.e. two directions) A and B in opposite directions which each include different stops 3.

As explained in detail in document WO-A-94/02923, a central management station 4 (FIG. 2) collects, by radio or other means, data relating to the position of each bus 2 traveling on each route A or B line 1 and all other lines of the bus network. The central management station 4 works out from these data radio messages which each contain in particular an identification of each bus 2 and data representative of the position of this bus 2, which makes it possible in particular to know the distance d between said bus and next stop 3 on the route followed by this bus.

These radio messages are transmitted by the central management station 4 and are received in particular by individual portable boxes 10 (FIG. 3) which are in the possession of the users of the bus network.

• une antenne 11 associée à un dispositif de réception 12 de messages radio,
• un circuit 13 de décodage de ces messages,
• une mémoire 14,
• un microprocesseur 15,
• un écran vidéo 16 ou autre dispositif d'affichage,
• un clavier 17 à touches ou autre dispositif d'interrogation,
• une pile 18 ou autre alimentation électrique autonome,
• et un haut-parleur 19 ou autre émetteur de signaux sonores.

Each portable box 10 includes:

• an antenna 11 associated with a device 12 for receiving radio messages,
• a circuit 13 for decoding these messages,
• a memory 14,
• a microprocessor 15,
• a video screen 16 or other display device,
• a keyboard 17 with keys or other interrogation device,
• a battery 18 or other autonomous power supply,
• and a speaker 19 or other transmitter of sound signals.

• élaborer, à partir des messages radio reçus du poste central de gestion 4, des informations relatives au temps d'attente du ou des prochains autobus 2 à un arrêt donné 3 sur un parcours donné du réseau d'autobus,
• et faire apparaître ces informations sur l'écran 16 sur interrogation de l'usager.

As explained in the document WO-A-94/02923 mentioned above or in the document WO-A-94/02922, the microprocessor 15 is programmed to:

• develop, from radio messages received from the central management station 4, information relating to the waiting time of the next bus or buses 2 at a given stop 3 on a given route of the bus network,
• and display this information on the screen 16 upon interrogation of the user.

At the time of this display, the waiting time for the next bus at the stop selected by the user corresponds to a certain instant H0 initially scheduled for the arrival of this bus at the stop in question.

This arrival time initially planned H0 (or any other equivalent datum) is stored in memory 14, as well as the corresponding stop of the bus network, as well as the bus route comprising this stop and the bus line to which this route belongs.

Thereafter, even if the screen 16 turns off (either automatically or on user action), the portable unit 10 continues to receive radio messages cyclically from the central management station 4.

Among these radio messages, the microprocessor 15 selects those relating to the bus stop 3 previously stored, that is to say the bus stop which was selected by the user during his last interrogation of the box. 10.

From these radio messages, the microprocessor 15 cyclically recalculates an updated arrival time H provided for the next bus 2 at the stop 3 considered.

When the difference ΔH between H and H0 (in absolute value) is greater than a certain limit, the microprocessor 15 actuates the loudspeaker 19 so as to emit an audible signal which warns the user that he must consult again the screen 16 of the housing 10.

Preferably, the microprocessor 15 also controls the operation of the screen 16 and displays on this screen the current waiting time of the next bus 2 at the stop 3 considered, and / or the expected arrival time H of this next bus: thus, the user does not have to manipulate the keyboard 17 to check the updated waiting time of the next bus.

• soit une durée prédéterminée (par exemple : déclenchement d'un signal sonore dès que la différence ΔH est supérieure à 3 mn),
• soit une durée relative, correspondant par exemple à une fraction du temps qui reste à courir jusqu'à l'instant d'arrivée H0 initialement prévu pour le prochain autobus (par exemple, déclenchement d'un signal sonore lorsque AH est supérieure à 50 % du temps T0 restant à courir jusqu'à l'instant d'arrivée H0 initialement prévu).

The limit of the duration ΔH from which the emission of a sound signal is triggered can be, depending on the case:

• either a predetermined duration (for example: triggering of an audible signal as soon as the difference ΔH is greater than 3 min),
• or a relative duration, corresponding for example to a fraction of the time remaining until the arrival time H0 initially scheduled for the next bus (for example, triggering of an audible signal when AH is greater than 50% of the time T0 remaining to run until the arrival time H0 initially planned).

This limit may possibly be different depending on whether H is before or after H0.

If necessary, it could even be envisaged to warn the user only if H is earlier than H0 (bus in advance), although this variant is not preferred.

• une fraction (par exemple 50 %) du temps T0 qui reste à courir jusqu'à l'instant d'arrivée H0 initialement prévu pour le prochain autobus, si ce temps restant à courir est supérieur à une première durée prédéterminée T1 (par exemple 5 mn) ou si l'instant d'arrivée actualisé H est postérieur à l'instant d'arrivée H0 initialement prévu pour le prochain autobus,
• et une deuxième durée prédéterminée T2 (par exemple 30 secondes) lorsque le temps T0 restant à courir jusqu'à l'instant d'arrivée H initialement prévu pour le prochain autobus est inférieur à la première durée prédéterminée T1 et que l'instant d'arrivée H actuellement prévu pour le prochain autobus est antérieur à l'instant d'arrivée H0 initialement prévu.

Advantageously, the limit to which ΔH is compared is constituted by:

• a fraction (for example 50%) of the time T0 which remains to run until the time of arrival H0 initially planned for the next bus, if this time remaining to run is greater than a first predetermined duration T1 (for example 5 mn) or if the updated arrival time H is later than the arrival time H0 initially planned for the next bus,
• and a second predetermined duration T2 (for example 30 seconds) when the time T0 remaining to run until the arrival time H initially scheduled for the next bus is less than the first predetermined duration T1 and that the time of arrival H currently planned for the next bus is earlier than the arrival time H0 initially planned.

One can imagine for example that a user of the bus network consults at 12:15 p.m. his portable box 10 by selecting a particular bus line 1, one of the two routes A, B that this line presents (this is ie one of the two directions of the line), and a particular stop 3 on this route.

The portable unit 10 then indicates, for example, an expected waiting time of 15 minutes, which corresponds to an arrival time initially planned for the next bus at the desired stop H0 = 12:30 pm.

If, at 12:20 p.m., the microprocessor 15 updates the expected arrival time H and estimates that H = 12:25 p.m., then the difference ΔH between H0 and H is 5 min, and the time T0 remaining to run until arrival time H0 initially expected is 10 min.

This duration T0 = 10 min is greater than the first predetermined duration T1 = 5 min, so that the microprocessor compares the difference ΔH to the limit T0 x 50% = 5 min.

As ΔH reaches this limit, the microprocessor 15 emits an audible signal by the loudspeaker 19, and it can also cause for example the display on the screen 16 of the waiting time T currently estimated for the next bus to the desired stop 3, that is, in the example considered, 5 min.

This display is of course accompanied by sufficient explanatory data indicating for example to the user that the next bus to arrive at the desired stop 3 will be ahead of schedule and that it will arrive in 5 minutes.

Using the same example as above, if at 12:20 p.m., the microprocessor 15 considers that H is always equal to 10:30 a.m., then it does not trigger the operation of the loudspeaker 19 and the screen 16.

Thereafter, if for example at 12:26 pm the microprocessor 15 estimates that H = 12:29 pm, then ΔH = 1 min and T0 = 4 min.

This duration T0 = 4 min is less than the first predetermined duration T1 = 5 min, so that the microprocessor 15 compares ΔH = 1 min with the second predetermined duration T2 = 30 s.

As the difference ΔH = 1 min is greater than T2 = 30 s, the microprocessor 15 then causes an audible signal to be emitted by the speaker 19 and it simultaneously causes the display on the screen 16 of the waiting time T currently estimated for the next bus at the desired stop 3, that is, in the example considered, 3 min.

• un premier signal sonore (par exemple un seul signal relativement long, de l'ordre de 2 à 5 s), lorsque la différence ΔH est supérieure à la limite susmentionnée, mais que H est postérieur à H0 (autobus en retard),
• un deuxième signal sonore (par exemple une suite de signaux brefs espacés) lorsque ΔH est supérieure à la limite susmentionnée, et que H est antérieur à H0 (autobus en avance) la limite susmentionnée étant relativement faiblement dépassée par ΔH (par exemple, ΔH ne dépasse pas cette limite de plus de 10 %),
• et un troisième signal sonore (par exemple une suite de signaux brefs rapprochés) lorsque ΔH est supérieure à la limite susmentionnée, et que H est antérieur à H0 (autobus en avance) la limite susmentionnée étant relativement largement dépassée par ΔH (par exemple, ΔH dépasse cette limite de plus de 10 %).

Preferably, the loudspeaker 19 is adapted to emit several distinct sound signals, in which case the microprocessor 15 is advantageously provided to make emit:

• a first sound signal (for example a single relatively long signal, of the order of 2 to 5 s), when the difference ΔH is greater than the abovementioned limit, but H is later than H0 (late bus),
• a second sound signal (for example a series of short spaced signals) when ΔH is greater than the aforementioned limit, and that H is earlier than H0 (bus in advance) the aforementioned limit being relatively slightly exceeded by ΔH (for example, ΔH does not not exceed this limit by more than 10%),
• and a third sound signal (for example a series of short close signals) when ΔH is greater than the aforementioned limit, and when H is earlier than H0 (bus in advance) the aforementioned limit being relatively largely exceeded by ΔH (for example, ΔH exceeds this limit by more than 10%).

• les informations relatives au temps d'attente et/ou au temps d'arrivée des prochains autobus aux différents arrêts du réseau seraient élaborées par le poste central de gestion 4 et non par chaque boîtier portatif 10, ces informations étant ensuite transmises aux différents boîtiers portatifs par voie hertzienne ;
• chaque boîtier portatif 10 permettrait d'informer un usager uniquement sur les temps d'attente à un arrêt prédéterminé du réseau d'autobus, le clavier 17 étant alors simplifié, voire réduit à un seul bouton marche/arrêt ;
• l'écran 16 serait remplacé par une autre interface, par exemple un synthétiseur vocal ;
• les différents signaux sonores qui peuvent être émis par le haut-parleur 19 se distingueraient les uns des autres non pas uniquement par leur modulation, mais par leur fréquence ou encore à la fois par leur modulation et leur fréquence ;
• le haut-parleur 19 serait remplacé ou assisté par un émetteur de signaux lumineux et/ou un vibreur pouvant émettre des vibrations perceptibles par un utilisateur portant le boîtier 10 sur lui, cet émetteur de signaux lumineux et/ou ce vibreur étant adaptés le cas échéant pour émettre des signaux lumineux et/ou vibrationnels différents suivant la situation, ces divers signaux se distinguant les uns des autres le cas échéant par leur fréquence (longueur d'onde) et/ou par leur modulation ;
• les informations d'attente données par le boîtier 10 ne seraient pas relatives au prochain autobus, mais seraient relatives à un autobus déterminé qui ne serait pas le prochain à arriver à l'arrêt considéré.

As is obvious, and as it follows from the above, the invention is not limited to the particular embodiment which has just been described; on the contrary, it embraces all variants, in particular those in which:

• the information relating to the waiting time and / or the arrival time of the next buses at the various network stops would be prepared by the central management station 4 and not by each portable unit 10, this information then being transmitted to the various portable units over the air;
• each portable unit 10 would make it possible to inform a user only of the waiting times at a predetermined stop of the bus network, the keyboard 17 then being simplified, or even reduced to a single on / off button;
• screen 16 would be replaced by another interface, for example a speech synthesizer;
• the different sound signals which can be emitted by the loudspeaker 19 are distinguished from one another not only by their modulation, but by their frequency or both by their modulation and their frequency;
• the loudspeaker 19 would be replaced or assisted by a light signal transmitter and / or a vibrator capable of emitting vibrations perceptible by a user carrying the housing 10 on him, this light signal transmitter and / or this vibrator being adapted where appropriate to emit different light and / or vibrational signals depending on the situation, these various signals being distinguished from each other if necessary by their frequency (wavelength) and / or by their modulation;
• the waiting information given by the unit 10 would not relate to the next bus, but would relate to a specific bus which would not be the next to arrive at the stop in question.

Claims (11)

Portable box (10) for informing the users of a bus network about the waiting times at at least one stop (3) on at least one bus route (A, B) belonging to this network, this box including: - radio reception means (11, 12) for receiving over the air data enabling the abovementioned waiting times to be known, - interrogation means (17) operable by a user to access waiting information intended to inform this user at least about the waiting time of a certain bus at the stop considered on the route considered, these waiting information corresponding to a certain scheduled time of arrival of the bus in question at the stop in question, - and interface means (16) controlled by an electronic central unit (15) for communicating said waiting information to the user, housing characterized in that it further comprises signaling means (19) capable of attracting the attention of the user,
and in that the central unit is suitable for: - store at least data representative of the arrival time H0 initially planned for the bus (2) considered at the stop considered on the route considered, this time H0 corresponding to the waiting information communicated to the user during the last interrogation of the box by this user, - from the data received by the radio reception means (11, 12), cyclically take into account data representative of an updated arrival time H provided for the bus considered at the stop considered on the route considered, - and activate the signaling means (19) when the arrival times H and H0 differ by a duration ΔH greater than a certain limit. Portable box according to claim 1, adapted to inform users about waiting times at several stops (3), the interrogation means (17) being provided to allow the user to select a particular stop (3) on a bus route (A, B) belonging to the network, the central unit (15) then being designed to inform the user at least of the waiting time of the bus considered at the stop selected on the route selected, and the central unit being adapted to memorize at least the last stop (3) selected by the user during his last interrogation as well as the corresponding bus route (A, B), the arrival times H0 and H being relative to said selected stop. A portable housing according to claim 1 or claim 2, wherein said limit corresponds to a predetermined duration. Portable housing according to claim 1 or claim 2, wherein said limit corresponds to a fraction of the time remaining until the arrival time H0 initially planned. Portable housing according to claim 1 or claim 2, wherein said limit is different depending on whether the updated arrival time H is before or after the arrival time H0 originally planned. Portable housing according to claim 1 or claim 2, wherein said limit consists of: - a fraction of the time remaining to run until the arrival time H0 initially planned, if this time remaining is greater than a first predetermined duration or if the updated arrival time H is later than arrival time H0 initially planned, - And a second predetermined duration when the time remaining until the arrival time H0 initially planned is less than the first duration predetermined and that the updated arrival time H is earlier than the arrival time H0 initially planned. Portable housing according to any one of the preceding claims, in which the signaling means (19) are adapted to emit an audible audible signal. Portable housing according to any one of the preceding claims, in which the signaling means (19) are adapted to transmit several different signals, the central unit (15) being designed to cause the signaling means to transmit distinct signals according to whether the updated arrival time H is before or after the arrival time H0 initially planned. Portable box according to any one of the preceding claims, in which the signaling means (19) are adapted to transmit several different signals, the central unit (15) being designed to cause distinct signals to be transmitted by the signaling means according to whether the duration ΔH more or less exceeds the above-mentioned limit from which a signaling is triggered. Portable housing according to any one of the preceding claims, in which the interface means (16) are display means, and the central unit (15) is designed to be displayed by the display means (16) waiting information corresponding to the stop (3) considered on the route considered, when said central unit actuates the signaling means (19). Portable case according to any one of the preceding claims, in which the bus (2) considered is the next bus to arrive at the stop (3) considered on the bus route (A, B) considered.

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