Plus+ 3rd generation traffic control system

The latest development in traffic control uses distributed intelligence to increase intersection uptime and reduce on-street installation and maintenance time

With financial and people limitations and increasing pressure on our congested road infrastructure it's no surprise to know that on-street engineering time is a major challenge for those responsible for traffic management.     The new ST950 Plus+ system from Siemens no longer uses many individual connections between signal heads and controllers; instead it uses simple four core cables and intelligent communications to reduce the installation effort, as well as saving valuable resources.     Plus+ uses dedicated failsafe controllers, signal heads, and pedestrian indicators as well as new smartloop modules ensuring that the overall system is tolerant of individual component and cable damage, resulting in higher intersection availability and reduced disruption to the travelling public.


Addressing the safety and availability challenges when delivering distributed Traffic Control systems

We will be exploring the safety and system challenges which have been successfully addressed in the Siemens Plus+ system, to ensure that a distributed Traffic Control system delivers both savings in on-street implementation as well as maximum on-going availability under a wide range of possible fault conditions.

This topic was presented at the JCT Traffic Signal Symposium & Exhibition

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System overview

Traffic control system


Quicker and safer to install with Plus+ compared to a traditional traffic control system:

  • Fewer, lighter cables are needed
  • Cabling approach makes use of low-level access poles much easier
  • Cabling approach makes pre-assembly of poles and heads more efficient

All of these factors mean that there is potentially a significant reduction in on-street working time, meaning a quicker and safer installation.

Plus+ cabling diagram

Traffic control toolset

Siemens Plus+ offers a powerful toolset to support and simplify the design, installation, commissioning and maintenance processes.

To help simplify the design process, an AutoCAD plug-in works alongside normal site layout drawing tools to capture the full information about a junction's characteristics and component relationships. By calculating the full parameters for rings and arms (and identifying cable runs and node assignments are within design limits), the design process is made as efficient as possible. On completion of the design process, an equipment inventory and controller capacity specification is provided.   The tool set allows the installer to use the data from the design process to map physical signal heads and nodes to their use and geographical location. If needed the engineer can then adjust the configuration during installation to adapt to last minute on-site challenges or physical environment factors.   This is all backed up with bar-code scanning to ensure correct identification of components
Enhanced ST950 Plus+ design and configuration suite

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