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ISA across Europe

ISA across Europe. Overview November 2002. S. Warning system “speed checker” Ume å. Active accelerator. Trials around Europe - S. Sweden. Swedish findings and strategy. Accident prediction in line with earlier UK report National map to be created ISA will be fitted to SNRA fleet

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ISA across Europe

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  1. ISA across Europe Overview November 2002

  2. S Warning system “speed checker” Umeå Active accelerator Trials around Europe - S Sweden

  3. Swedish findings and strategy • Accident prediction in line with earlier UK report • National map to be created • ISA will be fitted to SNRA fleet • Agreement to be secured with car industry by 2005 to fit all new vehicles as of 2010 • If no agreement is obtained, then the Minister has said he will push for a directive

  4. NL DK o Driver acceptability and Technical possibilities ISA around Euope – NL & DK Comparison of different designs

  5. New projects in: • France (with involvement of Renault and Peugeot/Citroen) • Belgium (2 projects)

  6. UK research on ISA • DETR funded External Vehicle Speed Control (EVSC) project,1997-2000 • Develop a technical specification of a future system • Assess legal implications and acceptability • Study driver behaviour • Predict accident savings and side effects (congestion, fuel consumption, emissions) • Design an implementation strategy • DfT funded ISA project, 2001-05 • Field trials with 20 vehicles • Further experimental work • Technology development • Motorcycle and large truck demonstrators

  7. Driver behaviour with ISA

  8. 72 drives 42 mile route Route covered all road categories and all speed limits except 20 mph 2 ISA variants studied — voluntary and mandatory On-road trials in EVSC (external vehicle speed control)

  9. 70 Without ISA With ISA 60 50 40 Speed (mph) village village 30 (40mph) (40mph) 20 10 roundabout 0 4 5 6 7 8 9 10 Distance along route (miles) Speed profile (mandatory system) in rural area

  10. Negative interactions and conflicts

  11. Findings from on-road trials • Driver speed was mostly dictated by road geometry and traffic • ISA most effective in urban areas/rural villages • Drivers thought the voluntary system was preferable • Drivers did not feel “out of the loop” or exhibit signs of being so

  12. Accident Prediction and Implementation Path

  13. Advisory speed limiter: change in mean speed Mandatory speed limiter: change in shape of distribution Changes in distribution of speeds

  14. Mean speed:For each 1 mph change in mean speed the change in accident risk is as follows (derived from Finch et al., 1994): Low estimate 3.75% Best estimate 5.00% High estimate 9.70% Speed variance: The formula applied for the relationship between speed variance and risk was derived from West and Dunn (1971) and is: y = 0.0139x2 + 0.0140x where y is relative risk and x is the speed difference of a vehicle from mean speed in mph Formulae used for accident prediction

  15. Predicted accident reduction from ISA for GB • Advisory:information only • Driver Select:voluntary control • Mandatory:speed limited all the time • Fixed:limits as now (posted) • Variable:+ lower where needed • Dynamic:+ lower when needed 59% reduction in fatal accidents

  16. Other benefits Annual saved fuel consumption: • Petrol £198m • Diesel £117m

  17. Costs • Information supply • Create digital road maps • Maintain road maps • Distribute road maps • (Broadcast current speed limits) • On-board system to locate vehicle • Control on the vehicle • HMI

  18. B/C ratios for alternative versions of ISA

  19. Mandatory usage 2019 Voluntary usage Production 2013 Manufacture Standards enacted 2010 Standards Decision 2005 Research 2000 2020 The recommended implementation scenario from the EVSC project This gives time for implementing dynamic ISA

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