Commission Decision of 5 June 2009 on the adoption of a common safety method for assessment of achievement of safety targets, as referred to in Article 6 of Directive 2004/49/EC of the European Parliament and of the Council (notified under document number C(2009) 4246) (Text with EEA relevance) (2009/460/EC)

3.3.1. For each Member State and for each of the risk categories to which the Moving Weighted Averaging (MWA) is applied for carrying out, in each year Y (starting from Y = 2010 onwards), the assessment steps described in section 3.2, the following phases shall be applied for calculating the MWA_Y:

(a)

calculation of the annual observations OBS _i returned by the corresponding indicators listed in Appendix 1, after providing as input the data available from the sources referred to in section 1.1 for the relevant years (the index i takes the values as defined in the formula below);

(b)

calculation of the arithmetic n-year average (AV) of annual observations OBS_i [initially n = 4; from 2012 onwards n = 5];

(c)

calculation of the absolute value of the difference ABSDIFF _i between each annual observation OBS_i and the AV. If ABSDIFF_i < 0,01 * AV, to ABSDIFF_i is attributed a constant value equal to 0,01 * AV;

(d)

calculation of the weight W_i , by taking the inverse of ABSDIFF_i ;

(e)

calculation of the MWA_Y as follows:

;

where i is a natural number and

if Y = 2010 or 2011: x = Y – 5; N = Y – 2 if Y ≥ 2012: x = Y – 6; N = Y – 2