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Purpose SPIs
The purpose of SPI is:
- to reflect the current safety conditions of a road traffic system (i.e. they are considered not necessarily in the context of a specific safety measure, but in the context of specific safety problems or safety gaps)
- to measure the influence of various safety interventions, but not the stage or level of application of particular measures
- to compare between different road traffic systems (e.g. countries, regions)
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