Statistical sources and measurement units for calculating NRVs and CSTs
1.1.
Statistical sources
1.1.1.
The NRVs and the CSTs shall be calculated on the basis of data on railway accidents and related consequences, reported according to Annex H to Regulation (EC) No 91/2003 and according to provisions of Articles 5, 18 and Annex I to Directive 2004/49/EC.
1.1.2.
Within the framework of determining the first set of CSTs, in case of inconsistencies between data coming from the two sources referred to in point 1.1.1, data reported according to Annex H to Regulation (EC) No 91/2003 shall have precedence.
1.1.3.
The time series of data which will be used for attributing values to NRVs and CSTs shall include the four most recent reported years. No later than 31 January 2011 the Agency shall propose to the Commission the adoption of updated values for NRVs and CSTs, calculated from data for the six most recent reported years.
1.2.
Measurement units for NRVs
1.2.1.
The measurement units for NRVs shall be expressed in compliance with the mathematical definition of risk. The consequences of accidents which shall be considered for each of the risk categories are the FWSIs.
1.2.2.
The measurement units which shall be used for quantifying NRVs for each of the risk categories are laid down in Appendix 1 and result from the application of the principles and definitions referred to in point 1.2.1 and, where relevant, point 1.2.3. The measurement units include the scaling bases listed in Appendix 1, for the normalisation of NRVs.
1.2.3.
For each of the risk categories ‘passengers’ and ‘level crossing users’ two different NRVs shall be set, expressed with the two different measurement units referred to in Appendix 1. For the purposes of the assessment of achievement referred to in chapter 3, compliance with at least one of these NRVs shall be considered sufficient.
1.3.
Measurement units for CSTs
1.3.1.
The measurement units to be used for quantifying CSTs for each of the risk categories shall be the same as the ones described for NRVs in section 1.2.
2.
Methodology for calculating NRVs and for deriving CSTs
2.1.
Methodology for calculating NRVs
2.1.1.
For each Member State and for each of the risk categories the NRV shall be calculated by applying in sequential order the following process:
(a) calculation of the values returned by the corresponding measurement units listed in Appendix 1, by considering the data and provisions referred to in section 1.1;
(b) analysis of the results of the process described in point (a), to check presence and recurrence of zero values for the FWSIs in the observed safety performances for the years concerned;
(c) if the zero values referred to in point (b) are no more than two, the calculation is made of the weighted average of the values referred to in point (a), as described in section 2.3, and the returned value is taken as the NRV;
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