SIST EN 12675:2017

Traffic signal controllers - Functional safety requirements

This European Standard specifies the functional safety requirements for traffic signal controllers. It is applicable to traffic signal control equipment permanent¬ly and temporarily installed, but excludes portable traffic control equip¬ment. Traffic signal controllers, as defined by this European Standard, are required to control conflicting traffic, both vehicular and pedestrian,  e.g. junction signals, pedestrian crossings, shuttle signals, public transport signals, in a safe manner.  
The electrical safety requirements and additional traffic safety requirements, the interfacing with external equip¬ment and the test methods for verifying compliance with this European Standard are contained in HD 638.
NOTE  National requirements may specify special conditions for public transport signals (PT) and for any other signal that is not specified in a European Standard.

Steuergeräte für Lichtsignalanlagen - Funktionale Sicherheitsanforderungen

Diese Europäische Norm legt die funktionalen Sicherheitsanforderungen an die Steuergeräte für Straßenverkehrs-Signalanlagen fest. Sie ist auf fest und vorübergehend errichtete Steuergeräte für Straßenverkehrs-Signalanlagen und auf ortsveränderliche Anlagen zur Verkehrssteuerung anwendbar; ausgenommen sind ortsveränderliche Signalanlagen zur Verkehrssteuerung, die nur wechselseitige (alternierende) Fahrspuren/Fahrspuren an Engstellen (wie nachstehend in 3.37 definiert) ohne die Regelung querender Fahrzeug- oder Fußgängerbewegungen steuern. Steuergeräte für Straßenverkehrs-Signalanlagen, die durch diese Europäische Norm festgelegt sind, sind zur sicheren Steuerung des unverträglichen Straßenverkehrs durch Fahrzeuge und Fußgänger erforderlich, z. B. Kreuzungssignalisierungen, Fußgängerüberwege, Engstellen-Signalisierungen, Signalisierungen für den öffentlichen Personenverkehr.
Die elektrischen Sicherheitsanforderungen und zusätzlichen Verkehrssicherheitsanforderungen, die Schnittstellen mit externen Geräten sowie die Prüfverfahren zum Nachweis der Übereinstimmung mit dieser Europäischen Norm sind in EN 50556 enthalten.
Für eine vollständige Anwendbarkeit dieser Europäischen Norm sowie auch von EN 50556, werden die nationalen Normungsorganisationen gebeten, die Auswahl der Klassen festzulegen, die für ihre nationalen Anforderungen relevant sind.
ANMERKUNG   Nationale Anforderungen können die besonderen Bedingungen für Signale der öffentlichen Verkehrsmittel und für jedes andere Signal festlegen, das nicht in einer Europäischen Norm festgelegt ist.

Contrôleurs de feux d'intersection - Prescription de sécurité fonctionnelle

La présente Norme européenne spécifie les exigences de sécurité fonctionnelle pour les contrôleurs de
signaux de circulation routière. Elle est applicable aux équipements de commande des signaux de circulation
routière installés à titre permanent et provisoire, ainsi qu'aux équipements de commande des signaux de
circulation routière portables, à l'exception de ceux qui peuvent uniquement commander des voies à
circulation alternée (telles que définies ci-après en 3.37), et qui ne gèrent pas d’intersection avec des courants
de véhicules ou de piétons. Les contrôleurs de signaux de circulation routière définis dans la présente Norme
européenne doivent gérer en toute sécurité les courants de circulation antagonistes de véhicules et de
piétons, par exemple aux carrefours, aux passages pour piétons, dans les zones de circulation alternée ou de
circulation de véhicules de transport en commun.
Les exigences de sécurité électrique, les exigences supplémentaires de sécurité de la circulation, l'interfaçage
avec les équipements extérieurs et les méthodes d'essais destinées à vérifier la conformité avec la présente
Norme européenne figurent dans la norme EN 50556.
Pour une applicabilité totale de la présente Norme européenne tout comme de la norme EN 50556, les
organismes de normalisation des différents pays doivent définir l'ensemble des classes pertinentes pour leurs
exigences nationales.
NOTE Des exigences nationales peuvent spécifier des conditions particulières pour les signaux destinés aux
véhicules de transport en commun et pour tout autre signal ne faisant pas l'objet d'une Norme européenne.

Krmilniki za svetlobne prometne znake - Funkcionalne varnostne zahteve

Ta evropski standard določa funkcionalne varnostne zahteve za krmilnike za svetlobne prometne znake. Uporablja se za trajno in začasno nameščeno opremo za nadzor prometa, vendar pa ne zajema prenosne opreme za nadzor prometa. Krmilniki za svetlobne prometne znake, kot jih opredeljuje ta evropski standard, so potrebni za nadzor konfliktnega prometa tako vozil kot pešcev, npr. signalizacija v križiščih, prehodi za pešce, signalizacija na zoženjih, signalizacija za javni prevoz, na varen način.  
Električne varnostne zahteve in dodatne zahteve glede prometne varnosti, povezovanje z zunanjo opremo in preskusne metode za preverjanje skladnosti s tem evropskim standardom so zajete v standardu HD 638.
OPOMBA Nacionalne zahteve lahko določajo posebne pogoje za signalizacijo za javni prevoz (PT) in za katero koli drugo signalizacijo, ki ni določena v evropskem standardu.

General Information

• Status: Published
• Public Enquiry End Date: 29-May-2015
• Publication Date: 11-Sep-2017
• ICS: 93.080.30 - Road equipment and installations
• Technical Committee: OCE - Road equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 31-Aug-2017
• Due Date: 05-Nov-2017
• Completion Date: 12-Sep-2017
• Ref Project: EN 12675:2017 - Traffic signal controllers - Functional safety requirements

Relations

• Replaces: SIST EN 12675:2002 - Traffic signal controllers - Functional safety requirements
• Effective Date: 01-Oct-2017

Overview

EN 12675:2017 - "Traffic signal controllers - Functional safety requirements" (CEN) defines the functional safety requirements for traffic signal controllers used to manage vehicular and pedestrian traffic. The standard applies to permanently and temporarily installed traffic signal control equipment (excluding limited portable shuttle-only units) and focuses on preventing hazardous signal displays by requiring fault detection, classification and safe-state responses. Electrical safety, interfacing and test methods are addressed in the related standard EN 50556 (HD 638 referenced in earlier editions).

Key Topics

• Scope and definitions: Clear definitions for terms such as signal group, absent/unwanted signals, failure mode, major/minor fault, mode-specific operation, and time base frequency.
• Functional safety requirements: Minimum safety objectives ensuring controllers prevent or mitigate hazards from incorrect signal displays (e.g., failure to display red, conflicting green, incorrect sequences or timings).
• Diagnostic checks and monitoring: Requirements for power-up self-tests, continuous diagnostics of the controller logic, and methods of monitoring to detect faults.
• Fault classification and handling: Specification of major and minor faults, required responses (change to safe states like flashing yellow or signals off), and storage/recording of fault events.
• Conflict and absent-signal management: Rules addressing signal group conflicts (unwanted signals), absent red/green/yellow signals, and national signal regulations that may impose additional constraints.
• Safety timings and time settings: Requirements for safety-relevant timing parameters and the impact of timing faults on safe operation.
• User documentation, marking and labelling: Minimum documentation and labeling required to support safe operation, service and reprogrammable memory management.

Applications and Users

EN 12675:2017 is practical for stakeholders involved in the design, procurement, installation and maintenance of traffic control systems:

• Traffic signal manufacturers and controller designers (functional safety compliance)
• Road authorities and municipalities (specifying controllers for intersections, pedestrian crossings, shuttle signals and public transport signals)
• System integrators and central traffic management centres (ensuring safe network control and monitoring)
• Maintenance and inspection personnel (fault diagnostics, documentation and safe-state procedures)
• Test laboratories and certification bodies (verifying functional safety requirements in conjunction with EN 50556)

Related Standards

• EN 50556 - Road traffic signal systems (electrical safety, interfacing and test methods).
• National signal regulations - may define country-specific classes, sequences and additional requirements for public transport (PT) signals.

EN 12675:2017 is essential for ensuring that traffic signal controllers meet consistent, safety-focused requirements across European installations, reducing risks from signal failures and improving road-user safety.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Krmilniki za svetlobne prometne znake - Funkcionalne varnostne zahteveSteuergeräte für Lichtsignalanlagen - Funktionale SicherheitsanforderungenContrôleurs de feux d'intersection - Prescription de sécurité fonctionnelleTraffic signal controllers - Functional safety requirements93.080.30Cestna oprema in pomožne napraveRoad equipment and installationsICS:Ta slovenski standard je istoveten z:EN 12675:2017SIST EN 12675:2017en,fr,de01-oktober-2017SIST EN 12675:2017SLOVENSKI
STANDARDSIST EN 12675:20021DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12675
August
t r s y ICS
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s t x y wã t r r rEnglish Version
Traffic signal controllers æ Functional safety requirementsContrôleurs de signaux de circulation routière æ Exigences de sécurité fonctionnelle
Steuergeräte für Lichtsignalanlagen æ Funktionale Sicherheitsanforderungen This European Standard was approved by CEN on
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egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t x y wã t r s y ESIST EN 12675:2017

A-deviations . 19 Bibliography . 21
— fixed time operation mode; — traffic dependent operation mode; — standby operation mode; — manual operation mode; — failure mode; 3.13 monitoring method of collecting information about the traffic signal controller including diagnostic checks used to detect a fault condition SIST EN 12675:2017

Key 1 single carriage way / bridge 2 carriageway restriction / road works Figure 1 — Example for Shuttle working lanes 4 Functional safety requirements 4.1 General This European Standard specifies the minimum safety requirements for traffic signal controllers to ensure the safe state of signals displayed to traffic. This safety consists of preventing a fault, or the consequences of a fault, that could result in the display of information liable to present a hazard to road users. A hazard to road users is prevented by the ability of the traffic signal controller to detect a specified fault condition and to change to a safe state. The change to a safe state is determined by the ability of the traffic signal controller to respond to the occurrence of faults in accordance with Clause 5. A fault condition may be dependent on the configuration of signal groups for specific application requirements. The specified fault condition shall be classified as a major or minor fault condition and acted on accordingly. Diagnostic checks shall be provided within the traffic signal controller for the detection of specified fault conditions. This is achieved by monitoring the appropriate: SIST EN 12675:2017
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