A modification of the above procedure uses SECTORS in place of ZONES to define the area to be factored. To use this option put ‘S’ in column 1 of a record if the entries in columns 2 to 20 refer to sectors rather than zones. Again missing input fields are assumed to refer to the lowest or highest sector number as appropriate.
Clearly the sector option is only possible in those cases where a supplementary network or GIS file has been input in order to define sectors. It will not work with free-format inputs.
‘Mixed’ zone and sector files are also permitted; records without an S in column 1 are assumed to be based on zones. However zones and sectors cannot be mixed on the same line.
An alternative method for applying factoring at a sector-to-sector level is to create a .UFM matrix of the sector-to-sector factors and then use Option 13 under UFM Outputs (see 10.16.2) plus a .z2s file to “copy” those factors into a zone-to-zone .UFM file which may then be used to multiply the internal matrix (e.g., using a Fortran equation, 10.8.1). Note that this method is in fact potentially much more general in that the level at which the factoring is applied is not restricted to sectors as pre-defined for the internal matrix but may be based on any level of aggregation, e.g., by traffic borough, district, etc. etc. through the use of an appropriate .z2s aggregation file.