ISA Trial

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ISA Trial
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General information
Type: Field operational test
Tested system/service: Intelligent Speed Adaptation
Countries: Finland 24 test users
 ? partners  ? vehicles
Active from 2001 to 2001
Contact
Project short report (doc)
Petri Mononen
petri.mononen@vtt.fi
VTT Technical Research Center of Finland
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The objective was to answer the following questions:

  • How do the drivers experience the different types of ISA: Informative, compulsory and recording?
  • How does the ISA affect driving behaviour?
  • What are the differences between the different types of ISA systems?

In a field study 24 subjects drove the instrumented car with route guidance and Intelligent Speed Adaptation (ISA). Every subject drove the same route four times. The route included different types of traffic environment with different speed limits. The speed limits were 40, 60, 70 and 80 kilometres per hour and the environment varied from motorway to residential area.

Details of Field Operational Test

Start date and duration of FOT execution

The project was performed in 2001.

Geographical Coverage

Link with other related Field Operational Tests

Objectives

The objective was to answer the following questions:

  • How do the drivers experience the different types of ISA: Informative, compulsory and recording?
  • How does the ISA affect driving behaviour?
  • What are the differences between the different types of ISA systems?

Results

The driving time differences from the base level to the different ISA systems were not significant. However, ISA systems seemed to be effective in reducing speeding, especially excessive speeding. The most effective speed reducer seemed to be the compulsory system. The informing system was also effective and some reduction was also seen with the recording system.

The problem is that the acceptability of ISA systems was just the opposite. The compulsory system was rejected, and the informing system was not found very enjoyable. Nevertheless, the drivers approved this one more, because they felt that they still had control of their car, even though the voice signal was considered to be annoying. In the WORKLOAD interviews and in the free comments the drivers were very pleased with the extra information. The recording system was the most popular. One interesting point is how effective the recording system would be in the future, in everyday use. The recording system was tested without any mentioned consequences – the speed offence result was only indicated to the driver himself and the experimenter.

Lessons learned

Main events

Financing

Summary, type of funding and budget

Cooperation partners and contact persons

  • Public Authorities:
  • Industry
    • Vehicle Manufacturer:
    • Supplier:
  • Users:
  • Universities:
  • Research Institutes:
  • Others (specify):

Applications and equipment

Applications tested

Route guidance and Intelligent Speed Adaptation. The route included different types of traffic environment with different speed limits. The speed limits were 40, 60, 70 and 80 kph and the environment varied from motorway to residential area.

Vehicle

The instrumented vehicle is a normal passenger car with concealed measuring equipment that is based on the Global Positioning System (GPS). The car ‘knows’ the current speed limit by the location.

Equipment carried by test users

Infrastructure

Test equipment

Methodology

Pre-simulation / Piloting of the FOT

Method for the baseline

The subjects drove the route four times, getting different information each time: One of the times the route was driven only with route guidance, which was used as a base level. The other three times driver used different types of ISA. Each driver used the systems in a different order to minimize the influence of learning. The ISA systems were an informing system, a compulsory system and a recording system.

Techniques for measurement and data collection

Objective data: speed

Subjective data: after every test drive, the driver answered questions about the system.

In order to obtain as reliable results as possible, the drivers were not told that their traffic behaviour was being recorded, but only that the research objective was to test the usability of the systems.

Recruitment goals and methods

24 drivers. The subjects were 30 to 50 years old. They were owners of a Toyota Corolla, with manual gears, which was the same type of vehicle used as the instrumented car. The subjects were selected randomly from the owners of cars similar to the instrumented car.

Methods for the liaison with the drivers during the FOT execution

Methods for data analysis, evaluation, synthesis and conclusions

Sources of information

http://www.its.leeds.ac.uk/projects/isa/in_depth/ISA%20-%20effects%20on%20driving%20behaviour.doc

Facts about "ISA Trial"
CompanyVTT Technical Research Center of Finland +
ContactPetri Mononen +
CountryFinland +
Ended2001 +
Is type ofField operational test +
NameISA Trial +
Number of test users24 +
Started2001 +
Tested system or serviceIntelligent Speed Adaptation +
Websitehttp://www.its.leeds.ac.uk/projects/isa/in depth/ISA - effects on driving behaviour.doc +
Email
This property is a special property in this wiki.
petri.mononen@vtt.fi +