Sitraffic One - The world’s most cost-effective traffic light

Energy efficiency is an important topic for cities and communities. Energy-efficient applications can lower overheads on the one hand, and on the other hand offer more sustainability and create a greener image.  In an effort to help you lower the running costs for your traffic control system and at the same time improve sustainability, Siemens has developed Sitraffic One – the world’s most cost-effective traffic light.

Infrastructure challenges which can be addressed with Sitraffic One

Growing traffic volumes, increasing air pollution and rising costs: A mobility solution alone will not resolve all your infrastructure challenges. It will, however, contribute to making your city or community more modern, attractive and environmentally friendly.

Here is an overview of how Sitraffic One can assist you:

  • You’ll need less electricity for the running of traffic light systems.

  • You’ll therefore reduce your energy costs.

  • You’ll significantly reduce CO2 emissions.

  • You’ll improve the reliability of your traffic lights with SIL3 – the highest available safety certificate in traffic technology.

  • You’ll ensure interruption-free traffic light operation despite power fluctuations (which may occur due to the use of renewable energy).

  • You’ll enhance the image of your city or community to a “Green City”.

  • You’ll improve the quality of life in metropolitan areas long-term.

Sitraffic One – saves energy and lowers costs

  • Sitraffic One reduces the power consumption of a traffic light to 1-2 watts.

  • The energy efficiency of standard 230 V LED technology is improved by more than 85%.

  • In effect, around 1600 kWh can be saved at an average traffic intersection per year (the equivalent of the annual consumption of a single person household).

  • That will prevent more than 960 kg of harmful CO2 emissions being released into the atmosphere each year.

  • For a metropolitan city like Berlin, this would mean a reduction of the annual energy costs by €500,000.

  • CO2 emissions would be reduced by approximately 2000 tons per annum (the City of Berlin would have to plant around 2000 deciduous trees per year to compensate for that amount of CO2 emissions).

  • In cities where many of the legacy bulbs are still in use, the investment costs for Sitraffic One will be amortized in less than five years.

How Sitraffic One saves power

  • Sitraffic One uses digital LED driver modules.

  • Sitraffic One works without high consumption analog load resistance and contact blocks in signaling devices.

  • Sitraffic One utilizes state-of-the-art LEDs with particularly low consumption profiles.

  • Sitraffic One functions on the basis of innovative monitoring technology to prevent accidental simultaneous green lights for opposing traffic – which additionally lowers energy consumption.

Pioneering innovation – Sitraffic One features highest safety level SIL3

Road traffic safety is hugely important. Traffic lights are in place for the protection of all road users – simultaneous green light for intersecting traffic lanes must always be avoided.

  • That is why Siemens is the first manufacturer worldwide to verify the function of LED signaling devices using optical monitoring.

  • This multi-layer monitoring concept has allowed Sitraffic One to reach SIL3 safety standard certification – a pioneering step in road safety.

Sitraffic One – reliable operation even during power fluctuations

The use of renewable energy systems frequently results in power fluctuations in the mains supply. For traditional traffic light systems that would mean: Traffic light failure as a worst case scenario. That will never happen with Sitraffic One. The innovative technology of Sitraffic One guarantees the fully functional availability of your traffic lights at all times.

This is how Sitraffic One ensures sufficient power supply during power fluctuations:

  • Sitraffic One disconnects the power supply to the signaling devices from the main power.

  • A buffer is created between the main power and the traffic light.

  • Fluctuations are compensated.

  • The traffic light system becomes significantly more robust and availability is increased.