EP0135641A1 - Integrated device, composed of independent modular elements, from which each function allows the localization and/or the display and/or the processing of numerical signals for use in public transport - Google Patents

Integrated device, composed of independent modular elements, from which each function allows the localization and/or the display and/or the processing of numerical signals for use in public transport Download PDF

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Publication number
EP0135641A1
EP0135641A1 EP83430034A EP83430034A EP0135641A1 EP 0135641 A1 EP0135641 A1 EP 0135641A1 EP 83430034 A EP83430034 A EP 83430034A EP 83430034 A EP83430034 A EP 83430034A EP 0135641 A1 EP0135641 A1 EP 0135641A1
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EP
European Patent Office
Prior art keywords
public transport
vehicle
integrated device
beacon
display
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Withdrawn
Application number
EP83430034A
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German (de)
French (fr)
Inventor
Francis Guillot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
D'etudes Et De Realisations Electrotechniques Et Electroniques Serel France SA Ste
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D'etudes Et De Realisations Electrotechniques Et Electroniques Serel France SA Ste
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Publication of EP0135641A1 publication Critical patent/EP0135641A1/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/123—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams

Definitions

  • Location beacons are placed in an area used by public transport lines. These beacons send and receive in microwave order coded digital signals relating to: the identification of the beacon; line number and vehicle number entering the area
  • the digital information coming from the beacons, by radio or wire, are taken into account in an input register constituted by a random access memory area which is continuously scanned by the logic processing unit.
  • the data received in this input register are compared with values corresponding to the tag numbers to be received at the panel in question. If the result of this test is positive, the logic processing unit sends the orders corresponding to the switching on or off of the indicator light or the display of the alphanumeric message on a display screen to the output unit.
  • a clock card can be used to give the time at the stop point.
  • An indicator light indicating the end of service of the lines is present on the panel.
  • the tags are made up of a code programming device identification of the location of the transmitter called “control logic” and of a transmission part called “microwave card”.
  • the control unit cyclically transmits its identification number in the form of a binary message coded in F.S.K modulation to the microwave card.
  • the control unit includes a quartz clock, division chains, a F.S.K type modulator, a power supply.
  • the microwave card is formed around a cavity fitted with a "Gun" diode, constituting the transmission device with its antenna.
  • a card fitted with a microwave cavity receives the signal from the beacon, amplifies it, transmits this signal to a decoder which will reproduce the message received from the beacon. This signal is tested by a microprocessor when this verification unit has determined that the message received is correct.
  • This identification value will be stored in the output register for use by the vehicle.
  • a device inside the public transport vehicle recognizes the identity of the beacon; this tag number received, compared with the line number present in the public transport vehicle, makes it possible to select the message corresponding to the name of the next stop and to display it in alphanumeric form.
  • An autonomous beacon entry system can be used to collect information on transit times, line numbers and transit vehicle numbers at a given point on a vehicle route.
  • the information is stored in a memory of the autonomous beacon. At the end of the measurement campaign, this data is transferred to the central computer or to a simpler system of data collection in order to determine the operating performance of a line of public transport vehicles.
  • Data transmission device relating to the location of a vehicle.
  • the beacon device cyclically transmits its identification code as well as the state of its supply battery; it is an autonomous device placed on any support: public lighting mast, arcades, etc.
  • the code emitted by the beacon is propagated by microwave wave in an action cone called zone of influence.
  • a microwave receiver device On board a vehicle there is a microwave receiver device and a signal processing logic equipped with a microprocessor.
  • This logic placed in the zone of influence of the beacon, recognizes the transmitted codes, verifies them and develops a valid message on the output device of the microprocessor card; this message is available for internal use of the public transport vehicle.
  • element 1 represents the modem, the radio, the wires. This element 1 is linked to element 2 which contains the input information. Element 2 is connected to the logic processing unit 3. The logic processing unit 3 is connected to the memory 4 EPROM which allows the identification of the beacon and to the output unit 5. The output 5 is connected to the screen or display panel 6.
  • the reference 7 represents the antenna which is connected to the microwave unit 8 which is connected to a microprocessor 9.
  • the information from the microprocessor 9 goes to an output register 10. From the output register 10, this information can be directly used on board the vehicle (name of a next stop, etc.).
  • Figure 3 shows the display unit inside the vehicle.
  • the reference 11 represents the element corresponding to the number of the tag; it is connected to the microprocessor 9, as well as the element 12 which corresponds to the line number.
  • the microprocessor 9 is connected at 13 to a table of the names of the stops and at 14 to the display in the vehicle by a panel.
  • the information of users at the stop point can be transmitted, by radio or wire, to panels fitted with a modem and a central processing unit with microprocessor, which will decode the delay information at the considered stop point , thus giving on the panel the state of positioning of the various public transport vehicles circulating on the different lines equipped with the location device.
  • Vehicles equipped with the microwave perception emission device may be recognized by autonomous beacons arranged on a particular route.
  • This beacon device makes it possible to collect the passage times, the equipped public transport vehicles as well as their vehicle numbers.
  • the information is stored in a memory which can be converted into a magnetic cassette medium, for subsequent analysis on a microcomputer in order to collect the different numbers of public transport vehicles, location, line numbers, passage time for statistical studies.
  • a computer collects all information relating to the movement of vehicles via the wired or radio network of the location device.

Abstract

Integrated device composed of independent modular elements (beacons, display panels, visual display unit) which can be interconnected via a central computer (16). The signal coming from the beacon situated at a place where vehicles pass is processed bit by bit to form a reliable message which is available, for subsequent analysis, in the output register on board the vehicle. The message received from the beacon on board the vehicle is tested by a microprocessor (15) which represents the receiver unit for all the information coming from the beacons, from the vehicles, from the radios or from the cables. This receiver unit (15) is connected to the central computer (16). A storage unit (18) and a display console (19) are also connected to the central computer (16). Use for public transport vehicles. <IMAGE>

Description

Des balises de localisation sont disposées dans une zone empruntée par des lignes de transport en commun. Ces balises envoient et reçoivent par ordre hyperfréquence des signaux numériques codés relatifs à : l'identification de la balise ; le numéro de ligne et le numéro de véhicule entrant dans la zoneLocation beacons are placed in an area used by public transport lines. These beacons send and receive in microwave order coded digital signals relating to: the identification of the beacon; line number and vehicle number entering the area

d'action formée par un cône radio-électrique défini par les ensembles émetteur récepteur de la balise et du véhicule. Ces éléments de base permettent l'utilisation du dispositif tel que :

  • - Dispositif de visualisation : aux arrêts véhicules de transport en commun.
of action formed by a radio cone defined by the transmitter-receiver assemblies of the beacon and of the vehicle. These basic elements allow the use of the device such as:
  • - Display device: at public transport vehicle stops.

Les informations numériques en provenance des balises, par voie radio ou filaire, sont prises en compte dans un registre d'entrée constitué par une zone de mémoire vive qui est scrutée en permanence par l'unité de traitement logique. Les données reçues dans ce registre d'entrée sont comparées à des valeurs correspondant aux numéros de balise devant être reçus au panneau considéré. Si le résultat de ce test est positif, l'unité de traitement logique envoie vers l'unité de sortie les ordres correspondant à l'allumage ou l'extinction du voyant lumineux ou l'affichage du message alphanumérique sur un écran de visualisation.The digital information coming from the beacons, by radio or wire, are taken into account in an input register constituted by a random access memory area which is continuously scanned by the logic processing unit. The data received in this input register are compared with values corresponding to the tag numbers to be received at the panel in question. If the result of this test is positive, the logic processing unit sends the orders corresponding to the switching on or off of the indicator light or the display of the alphanumeric message on a display screen to the output unit.

Une carte horloge peut être utilisée pour donner l'heure au point d'arrêt.A clock card can be used to give the time at the stop point.

Un voyant indiquant la fin de service des lignes est présent sur le panneau.An indicator light indicating the end of service of the lines is present on the panel.

Dispositif de transmission des données.Data transmission device.

Les -balises sont constituées par un organe de programmation du code d'identification du lieu où se trouve l'émetteur appelé "logique de commande" et d'une partie de transmission appelé "carte hyperfréquence".The tags are made up of a code programming device identification of the location of the transmitter called "control logic" and of a transmission part called "microwave card".

Fonctionnement.Operation.

La logique de commande transmet cycliquement son numéro d'identification sous forme d'un message binaire codé en modulation F.S.K vers la carte hyperfréquence.The control unit cyclically transmits its identification number in the form of a binary message coded in F.S.K modulation to the microwave card.

La logique de commande comprend une horloge à quartz, des chaines de division, un modulateur type F.S.K, une alimentation.The control unit includes a quartz clock, division chains, a F.S.K type modulator, a power supply.

La carte hyperfréquence est formée autour d'une cavité équipée d'une diode "Gun" constituant avec son antenne le dispositif de transmission.The microwave card is formed around a cavity fitted with a "Gun" diode, constituting the transmission device with its antenna.

A bord du véhicule, une carte équipée d'une cavité hyperfréquence reçoit le signal de la balise, l'amplifie, transmet ce signal vers un décodeur qui va restituer le message reçu de la balise. Ce signal est testé par un microprocesseur lorsque cette unité de vérification aura déterminé que le message reçu est correct.On board the vehicle, a card fitted with a microwave cavity receives the signal from the beacon, amplifies it, transmits this signal to a decoder which will reproduce the message received from the beacon. This signal is tested by a microprocessor when this verification unit has determined that the message received is correct.

Cette valeur d'identification va être rangée dans le registre de sortie pour utilisation par le véhicule.This identification value will be stored in the output register for use by the vehicle.

Unité d'affichage à l'intérieur du véhicule de transport en commun.Display unit inside the public transport vehicle.

Un dispositif à l'intérieur du véhicule de transport en commun reconnait l'identité de la balise ; ce numéro de balise reçu, comparé avec le numéro de ligne présent dans le véhicule de transport en commun, permet de sélectionner le message correspondant au nom du prochain arrêt et de l'afficher sous forme alphanumérique.A device inside the public transport vehicle recognizes the identity of the beacon; this tag number received, compared with the line number present in the public transport vehicle, makes it possible to select the message corresponding to the name of the next stop and to display it in alphanumeric form.

Centralisation des informations.Centralization of information.

L'ensemble des informations en provenance des balises et/ou des véhicules, par voie radio ou filaire, sont collectées sur un ordinateur permettant la gestion de ces informations, pour un fonctionnement en temps réel ou différé à des fins statistiques.All the information coming from the beacons and / or vehicles, by radio or wire, is collected on a computer allowing the management of this information, for a real-time or deferred operation for statistical purposes.

Recueil de données ponctuelles.Collection of specific data.

Un système de saisie par balise autonome peut être utilisé pour recueillir les informations des heures de passage, de numéros de ligne et numéros de véhicule de transport en commun à un point donné d'un parcours du véhicule.An autonomous beacon entry system can be used to collect information on transit times, line numbers and transit vehicle numbers at a given point on a vehicle route.

Les informations sont stockées dans une mémoire de la balise autonome. En fin de campagne de mesure, on transfère ces données sur l'ordinateur central ou sur un système plus simple de recueil de données afin de déterminer les performances de fonctionnement d'une ligne de véhicules de transport en commun.The information is stored in a memory of the autonomous beacon. At the end of the measurement campaign, this data is transferred to the central computer or to a simpler system of data collection in order to determine the operating performance of a line of public transport vehicles.

Dispositif de transmission de données relatif à la localisation d'un véhicule.Data transmission device relating to the location of a vehicle.

Le dispositif balise transmet cycliquement son code d'identification ainsi que l'état de sa batterie d'alimentation ; il s'agit du dispositif autonome placé sur un support quelconque : mât d'éclairage public, arcades, etc...The beacon device cyclically transmits its identification code as well as the state of its supply battery; it is an autonomous device placed on any support: public lighting mast, arcades, etc.

Le code émis par la balise se propage par onde hyperfréquence dans un cône d'action appelé zone d'influence.The code emitted by the beacon is propagated by microwave wave in an action cone called zone of influence.

A bord d'un véhicule se trouvent un dispositif récepteur hyperfréquence et une logique de traitement du signal équipée d'un microprocesseur. Cette logique, placée dans la zone d'influence de la balise, reconnait les codes transmis, les vérifie et élabore un message valide sur le dispositif de sortie de la carte microprocesseur ; ce message est disponible pour utilisation interne du véhicule de transport en commun.On board a vehicle there is a microwave receiver device and a signal processing logic equipped with a microprocessor. This logic, placed in the zone of influence of the beacon, recognizes the transmitted codes, verifies them and develops a valid message on the output device of the microprocessor card; this message is available for internal use of the public transport vehicle.

Les figures ci-jointes données à titre d'exemple indicatif et non limitatif permettront aisément de comprendre l'invention. Elles représentent un mode de réalisation préféré selon l'invention.

  • La figure 1 est un tableau synoptique du dispositif de visualisation aux arrêts du véhicule.
  • La figure 2 est un tableau synoptique du dispositif d'interrogation par la balise et d'utilisation des signaux par le véhicule.
  • La figure 3 est un tableau synoptique du dispositif de l'unité d'affichage à l'intérieur du véhicule.
  • La figure 4 est un tableau synoptique centralisant toutes les informations en provenance des balises ou des véhicules.
The attached figures given by way of indicative and non-limiting example will easily allow the invention to be understood. They represent a preferred embodiment according to the invention.
  • Figure 1 is a block table of the display device when the vehicle is stopped.
  • Figure 2 is a block table of the interrogation device by the beacon and use of signals by the vehicle.
  • Figure 3 is a block table of the device of the display unit inside the vehicle.
  • Figure 4 is a block table centralizing all the information from the beacons or vehicles.

Dans la figure 1, l'élément 1 représente le modem, la radio, les fils. Cet élément 1 est relié à l'élément 2 qui contient les informations d'entrée. L'élément 2 est relié à l'unité de traitement logique 3. L'unité de traitement logique 3 est reliée à la mémoire 4 EPROM qui permet l'identification de la balise et à l'unité de sortie 5. L'unité de sortie 5 est reliée à l'écran ou au panneau de visualisation 6.In figure 1, element 1 represents the modem, the radio, the wires. This element 1 is linked to element 2 which contains the input information. Element 2 is connected to the logic processing unit 3. The logic processing unit 3 is connected to the memory 4 EPROM which allows the identification of the beacon and to the output unit 5. The output 5 is connected to the screen or display panel 6.

Dans la figure 2, soit à bord du véhicule, la référence 7 représente l'antenne qui est branchée sur l'unité hyperfréquence 8 qui est reliée à un microprocesseur 9.In FIG. 2, either on board the vehicle, the reference 7 represents the antenna which is connected to the microwave unit 8 which is connected to a microprocessor 9.

Les informations du microprocesseur 9 vont à un registre de sortie 10. Du registre de sortie 10, ces informations peuvent directement être utilisées à bord du véhicule (nom d'un prochain arrêt, etc...).The information from the microprocessor 9 goes to an output register 10. From the output register 10, this information can be directly used on board the vehicle (name of a next stop, etc.).

La figure 3 représente l'unité d'affichage à l'intérieur du véhicule.Figure 3 shows the display unit inside the vehicle.

La référence 11 représente l'élément correspondant au numéro de la balise; il est relié au microprocesseur 9, ainsi que l'élément 12 qui correspond au numéro de la ligne.The reference 11 represents the element corresponding to the number of the tag; it is connected to the microprocessor 9, as well as the element 12 which corresponds to the line number.

Le microprocesseur 9 est relié en 13 à une table des noms des arrêts et en 14 à l'affichage dans le véhicule par un panneau.The microprocessor 9 is connected at 13 to a table of the names of the stops and at 14 to the display in the vehicle by a panel.

Dans la figure 4, 15 représente l'unité de réception de toutes les informations provenant des balises, des véhicules, des radios ou des câbles. Cette unité de réception 15 est branchée sur l'ordinateur central 16. Sur l'ordinateur central 16 sont également branchées une unité de stockage 18 et une console de visualisation 19.

  • a) Information pour l'usager à l'intérieur du véhicule de transport en commun : en fonction de l'identité de la balise reçue, un dispositif de visualisation affiche, dans le véhicule, le nom du prochain arrêt.
  • b) pour un dispositif de gestion centralisé :
  • L'information de localisation est transmise sur l'interface moderne de l'équipement radiotéléphone du véhicule, puis recueillie dans le poste central.
In Figure 4, 15 shows the unit for receiving all the information from beacons, vehicles, radios or cables. This reception unit 15 is connected to the central computer 16. On the central computer 16 are also connected a storage unit 18 and a display console 19.
  • a) Information for the user inside the public transport vehicle: depending on the identity of the beacon received, a display device displays the name of the next stop in the vehicle.
  • b) for a centralized management system:
  • The location information is transmitted on the modern interface of the vehicle's radiotelephone equipment, then collected in the central station.

L'information des usagers au point d'arrêt peut être transmise, par voie radio ou filaire, vers des panneaux équipés d'un modem et d'une unité centrale de traitement à microprocesseur, qui décodera les informations retardives au point d'arrêt considéré, donnant ainsi sur le panneau l'état du positionnement des divers véhicules de transport en commun circulant sur les différentes lignes équipées du dispositif de localisation.The information of users at the stop point can be transmitted, by radio or wire, to panels fitted with a modem and a central processing unit with microprocessor, which will decode the delay information at the considered stop point , thus giving on the panel the state of positioning of the various public transport vehicles circulating on the different lines equipped with the location device.

Les véhicules équipés du dispositif d'émission perception hyperfréquence pourront être reconnus par des balises autonomes disposées sur un parcours particulier. Ce dispositif de balise permet de recueillir les heures de passage, les véhicules de transport en commun équipés ainsi que leurs numéros de véhicule. Les informations sont stockées dans un mémoire transformable en support magnétique cassette, pour un dépouillement ultérieur sur un micro-ordinateur afin de recueillir les différents numéros de véhicules de transport en commun, localisation, numéros de ligne, heure de passage pour des études statistiques.Vehicles equipped with the microwave perception emission device may be recognized by autonomous beacons arranged on a particular route. This beacon device makes it possible to collect the passage times, the equipped public transport vehicles as well as their vehicle numbers. The information is stored in a memory which can be converted into a magnetic cassette medium, for subsequent analysis on a microcomputer in order to collect the different numbers of public transport vehicles, location, line numbers, passage time for statistical studies.

Un ordinateur collecte toutes les informations relatives au mouvement des véhicules par le réseau filaire ou radio du dispositif de localisation.A computer collects all information relating to the movement of vehicles via the wired or radio network of the location device.

Claims (4)

1. Dispositif intégré permettant la localisation, la visualisation et le traitement de signaux numériques pour utilisation dans les transports en commun, caractérisé par le fait qu'il est formé d'éléments modulaires indépendants (balises, panneaux de visualisation, écran de contrôle de visualisation) qui peuvent être interconnectés sur un ordinateur central (16).1. Integrated device for locating, viewing and processing digital signals for use in public transport, characterized by the fact that it is formed of independent modular elements (beacons, display panels, display control screen ) which can be interconnected on a central computer (16). 2. Dispositif intégré permettant la localisation, la visualisation et le traitement de signaux numériques pour utilisation dans les transports en commun selon la revendication 1, caractérisé par le fait que le signal issu de la balise située sur les lieux de passage des véhicules, est traité bit à bit pour former un message fiable et disponible dans le registre de sortie (10) qui est à bord du véhicule pour analyse ultérieure.2. Integrated device for locating, viewing and processing digital signals for use in public transport according to claim 1, characterized in that the signal from the beacon located at the places of passage of vehicles, is processed bit by bit to form a reliable message available in the output register (10) which is on board the vehicle for further analysis. 3. Dispositif intégré permettant la localisation, la visualisation et le traitement de signaux numériques pour utilisation dans les transports en commun selon l'une quelconque des revendications 1 ou 2, caractérisé par le fait que le message reçu de la balise à bord du véhicule est testé . par un microprocesseur (9).3. Integrated device for locating, viewing and processing digital signals for use in public transport according to any one of claims 1 or 2, characterized in that the message received from the beacon on board the vehicle is tested. by a microprocessor (9). 4. Dispositif intégré permettant la localisation, la visualisation et le traitement de signaux numériques pour utilisation dans les transports en commun selon l'une quelconque des revendications 1 ou 3, caractérisé par le fait que les signaux de la balise reçus à bord du véhicule sont traités à bord et disponibles pour être intégrés dans un dispositif central ordinateur de recueil (16).4. Integrated device for locating, viewing and processing digital signals for use in public transport according to any one of claims 1 or 3, characterized in that the beacon signals received on board the vehicle are processed on board and available for integration into a central collection computer device (16).
EP83430034A 1983-09-28 1983-09-29 Integrated device, composed of independent modular elements, from which each function allows the localization and/or the display and/or the processing of numerical signals for use in public transport Withdrawn EP0135641A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8315938A FR2552573B1 (en) 1983-09-28 1983-09-28 INTEGRATED DEVICE IN THE FORM OF INDEPENDENT MODULAR ELEMENTS OF WHICH EACH FUNCTION ENABLES LOCATION AND / OR VIEWING AND / OR PROCESSING OF DIGITAL SIGNALS FOR USE IN PUBLIC TRANSPORT
FR8315938 1983-09-28

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EP0135641A1 true EP0135641A1 (en) 1985-04-03

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EP83430034A Withdrawn EP0135641A1 (en) 1983-09-28 1983-09-29 Integrated device, composed of independent modular elements, from which each function allows the localization and/or the display and/or the processing of numerical signals for use in public transport

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EP (1) EP0135641A1 (en)
FI (1) FI841691A (en)
FR (1) FR2552573B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991014247A1 (en) * 1990-03-15 1991-09-19 Lauri Virtaperko Mass-transit communication system
FR2663446A1 (en) * 1990-06-13 1991-12-20 Cga Hbs System for guiding users in their use of public transport facilities
FR2694116A1 (en) * 1992-07-22 1994-01-28 Decaux Jean Claude Route indicator panel for use at bus stop - has illuminated section representing bus on route, allowing estimation of waiting time until arrival of next bus
WO2002002385A1 (en) * 2000-07-04 2002-01-10 Rbs Netkom Gmbh System for acquiring, transmitting and outputting travel data

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009375A (en) * 1974-05-13 1977-02-22 Peat, Marwick And Partners Monitoring system for vehicles
FR2336752A1 (en) * 1975-07-11 1977-07-22 Serel Network display indicating position of omnibuses - each vehicle having transmitter providing coded signal
FR2406266A1 (en) * 1977-10-14 1979-05-11 Bazille Joseph Bus transport alighting-boarding radio announcer and/or display - has transceiver in bus and at bus stop for coded signals communications

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009375A (en) * 1974-05-13 1977-02-22 Peat, Marwick And Partners Monitoring system for vehicles
FR2336752A1 (en) * 1975-07-11 1977-07-22 Serel Network display indicating position of omnibuses - each vehicle having transmitter providing coded signal
FR2406266A1 (en) * 1977-10-14 1979-05-11 Bazille Joseph Bus transport alighting-boarding radio announcer and/or display - has transceiver in bus and at bus stop for coded signals communications

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VERKEHR UND TECHNIK, vol. 8, 1970, pages 201-203, Berlin, DE *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991014247A1 (en) * 1990-03-15 1991-09-19 Lauri Virtaperko Mass-transit communication system
FR2663446A1 (en) * 1990-06-13 1991-12-20 Cga Hbs System for guiding users in their use of public transport facilities
FR2694116A1 (en) * 1992-07-22 1994-01-28 Decaux Jean Claude Route indicator panel for use at bus stop - has illuminated section representing bus on route, allowing estimation of waiting time until arrival of next bus
WO2002002385A1 (en) * 2000-07-04 2002-01-10 Rbs Netkom Gmbh System for acquiring, transmitting and outputting travel data

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Publication number Publication date
FI841691A0 (en) 1984-04-27
FI841691A (en) 1985-03-29
FR2552573B1 (en) 1986-05-30
FR2552573A1 (en) 1985-03-29

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