4.3.2  [SRI] Calculation

Each of SRImain in respect of a Road Section Length on the Strategic Route and [Main Distributor Network], SRIsec in respect of an [RSL] on the Secondary Distributor Network, SRIlink in respect of an [RSL] on the Link Road Network and SRIlocal in respect of an [RSL] on the [Local Access Road Network] is calculated in accordance with the following:

4.3.2.1  each Road Section Length shall be divided into 10m subsections;

4.3.2.2  each subsection shall be assigned the appropriate IL as given in the "threshold field" of the raw data file.  Where the IL changes within a 10m subsection, it shall be rounded down to the nearest 10m chainage.  For example an IL change occurring at chainage 435m shall be adjusted to reflect commencement at chainage 430m;

4.3.2.3  the score allocated in accordance with paragraph 4.3.2.2 shall then be subtracted from the relevant Sideways Force Co-efficient for that subsection and multiplied by 100 to give the number of points;  

4.3.2.4  the results of the subtraction in accordance with paragraph 4.3.2.3 which have negative values carried out in respect of each subsection those negative value subsections shall be added together in respect of all surveyed subsections in the [RSL] and this sum shall then be divided by the total length of all surveyed subsections in that [RSL] to produce the a percentage length of section below IL; and

4.3.2.5  the [RSL] shall be allocated an appropriate score in accordance with Table 11.6.