OpenLegislation

Division 6 Procedure for the alignment of a candidate laboratory

United Kingdom

Original text. Later amendments are not shown.

One reference laboratory (l) of the network shall calculate the linear regression function on all individual data of the candidate laboratory (c). The regression coefficients, A2 c and B2 c , shall be calculated as follows:

RRCm,l = A2 c × RRCm,c + B2 c

where:

RRCm,l

  • is the individual measured value of the rolling resistance coefficient by the reference laboratory (l) (including temperature and drum diameter corrections);

    • RRCm,c

  • is the individual measured value of the rolling resistance coefficient by the candidate laboratory (c) (including temperature and drum diameter corrections)

    • If the coefficient of determination R2 is lower than 0,97, the candidate laboratory shall not be aligned.

    The aligned RRC of tyres tested by the candidate laboratory shall be calculated as follows:

    RRC = (A1 l × A2 c ) × RRCm,c + (A1 l × B2 c + B1 l )