Daniel Berchtold, Head Business Unit Rail Automation, Schweizer Electronic

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Daniel Berchtold, Head Business Unit Rail Automation, Schweizer Electronic

  1. 1. Increasing Safety at User Worked Crossings – How can Human Factors be Considered in a Technical Approach Daniel Berchtold Head Business Unit Rail Automation Schweizer Electronic
  2. 2. Value for Money Systems Contents 1. Summary of relevant Human Factors on LX 2. Experience made during Swiss Trial 3. Network Rail requirements for EUWC 4. VaMoS: Technical Approach 5. Resulting safety requirements 6. How does cost influence safety? 7. Conclusion Carefree Signalling Solutions 07.03.2014
  3. 3. Value for Money Systems 1 Human Factors on LX  Unconscious failure – Distraction / Fatigue / Habit – Misunderstandings – Unclear situation / unclear indication  Conscious failure – Violation => avoiding waiting time – Wrong decision making => unawareness of risks Carefree Signalling Solutions 07.03.2014
  4. 4. Value for Money Systems 2 Experience from Swiss Trial Carefree Signalling Solutions 07.03.2014
  5. 5. Value for Money Systems 2 Experience from Swiss Trial  Red light well understood – absence of red light was not  Instructions were rarely read  Language problem  Uncertainty on persistent “Dark signal”  “No Red” was quickly associated with “No Train”  Waiting time was crucial  On-Call function was accepted/understood  Trust in system when indication clear and just-in-time Carefree Signalling Solutions 07.03.2014
  6. 6. Value for Money Systems 3 Network Rail Requirements Carefree Signalling Solutions 07.03.2014
  7. 7. Value for Money Systems 3 Network Rail Requirements  Minimum: Red Light & audible signal  Minimize warning time  Clear user interface / independent from user language  SIL 1 Carefree Signalling Solutions 07.03.2014
  8. 8. Value for Money Systems 4 VaMoS: Technical approach 1. Road User Interface: Red and Green light 2. Just-in-time warning: 10/20 secs 3. No instructions / unmistakable user indication Carefree Signalling Solutions 07.03.2014
  9. 9. Value for Money Systems 4 VaMoS: Technical approach Carefree Signalling Solutions 07.03.2014
  10. 10. Value for Money Systems 4 VaMoS: Technical approach Road User Interface  Well known principle (code of practice) – – – Green: GO Red: STOP Dark: Not in operation  Broadly understood (children, foreigners)  Fail-safe principle  Audible warning  No instructions Carefree Signalling Solutions 07.03.2014
  11. 11. Value for Money Systems 4 VaMoS: Technical approach Train Detection  Frauscher RSR123 wheel detection – – – – Fail-safe, reliable Maintenance free Exact train position Well proven  Just-in-time warning  Simple and easy to install  No interference with existing systems Carefree Signalling Solutions 07.03.2014
  12. 12. Value for Money Systems 5 Resulting Safety Requirements  Red and especially Green light indication MUST be fail-safe – Failed Red => increased risk for user – Failed Green => immediate danger – Risk based approach => SIL 3 like regular LX  Train indication and approaching time MUST be fail-safe  Much higher system availability – Dark mode = increased risk  Automatic, reliable, remote failure indication Carefree Signalling Solutions 07.03.2014
  13. 13. Value for Money Systems 6 How does cost influence safety ?  The lower the cost, the quicker and higher number of systems will be installed  Minimized power consumption => allows cost effective alternative power supplies  No maintenance => high maintenance cost is often an obstacle to install additional systems on a network Carefree Signalling Solutions 07.03.2014
  14. 14. Value for Money Systems 7 Conclusion  A fail-safe and reliable system with just-in-time warning combined with an unmistakable user interface remarkable reduces risk due to human misbehaviour  Red light is associated with immediate danger rather than just “waiting time”.  Supports “safe” decision making of the road user: Carefree Signalling Solutions 07.03.2014
  15. 15. Value for Money Systems 7 Conclusion "Assumed" value of violation Associated price of violation Old Gain of time = high value Little risk awareness = low price New No gain of time = small value Carefree Signalling Solutions Decision Violation is assumed being beneficial Red light means danger Waiting = is beneficial high price 07.03.2014
  16. 16. Value for Money Systems Questions? Carefree Signalling Solutions 07.03.2014

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