BS EN 12675:2017

What is BS EN 12675 - Functional safety requirements of traffic signal controllers about?  

Traffic signal controllers, as defined by BS EN 12675, are required to control conflicting traffic, both vehicular and pedestrian in a safe manner. Examples are junction signals, pedestrian crossings, shuttle signals, public transport signals. 

BS EN 12675 is applicable to traffic signal control equipment permanently and temporarily installed, and portable traffic control equipment, with the exception of portable traffic signal equipment only capable of controlling alternate / shuttle working lanes, without the control of crossing vehicular or pedestrian movements. 

The electrical safety requirements and additional traffic safety requirements, the interfacing with external equipment, and the test methods for verifying compliance with BS EN 12675 are contained in BS EN 50556. 

Who is BS EN 12675 - Functional safety requirements of traffic signal controllers for? 

BS EN 12675 on functional safety requirements of traffic signal controllers is useful for: 

• Road traffic signal and signal board manufacturers 
• Traffic signal controllers 
• Local government authorities 
• Transportation service providers 

Why should you use BS EN 12675 - Functional safety requirements of traffic signal controllers?  

The primary concern of traffic signal controller is to safeguard persons and objects against hazards due to conflicting signals to traffic. Traffic signal controllers also help to provide safe and smooth road traffic by conducting road traffic control in accordance with the time of day and the road traffic conditions, and also perform advanced road traffic control to eliminate road traffic congestion.   

BS EN 12675 is to specify the functional safety requirements of equipment used for the control of traffic signals. It relates to the control of signals to traffic, and any associated signalled traffic movements.  BS EN 12675 defines the minimum specification for a traffic signal controller with respect to safety for the road user. This safety consists of avoiding the display of incorrect messages on signals that are liable to endanger road users. Overall, BS EN 12675 provides safety requirements that can be adhered to while manufacturing which ensures product failure from collapse/detachment is prevented with fastening requirements, thus minimizing the risk of injury for road users by providing safety requirements. 

What is changed since the last update?  

BS EN 12675:2017 supersedes BS EN 12675:2001, which is withdrawn. 

BS EN 12675:2017 includes some technical changes with respect to BS EN 12675:2001. These include: 

• Clause 1, Scope: deleted the restriction of scope for portable traffic signal control equipment 
• Deleted the restriction of manual operation mode to an operator 
• Renamed and reordered the operation modes of a traffic signal controller 
• Extended the definition of traffic signal controller by the function of monitoring 
• Generalized the requirement on power up self-test 
• Deleted the requirement for ongoing operation of master clock and maintenance facilities in the case of a major fault 
• Restricted necessary user documentation to needs for safe operation and service