This tab is used to define Network Type Subclass’s for the selected Network Type. Network Type Subclass’s are commonly used as Indicators to denote the ‘type’ of a Network Element e.g., Left, Right or Single. The Network Type Subclass may also be incorporated as part of the Element reference number to ensure uniqueness.

The Type Subclass tab is used to define Network Type Subclass’s for the selected Network Type. Network Type Subclass’s are commonly used as Indicators to denote the ‘type’ of a Network Element e.g., Left, Right or Single. The Network Type Subclass may also be incorporated as part of the Element reference number to ensure uniqueness.

The Network Type Subclass may be an important indicator when establishing and using a Route and Offset linear referencing method. When calculating the length of a linear Route, and hence Offsets along the Route, the system must be able to identify the appropriate Elements to base its calculations on. For example, the length of a Road Network Type Route may be based on the total length of the Single Carriageway elements plus the total of the Left Carriageway elements where a Dual Carriageway or Divided highway exists. The Network Type Subclass would allow this distinction to be made.

When referencing events by a Route and Offset method, the position referenced may be ambiguous. For example, an Offset of 2.3 Kilometers on Route S234 may be ambiguous if this reference is locating a point on a Dual Carriageway or Divided Highway. By using Network Type Subclass’s, it is possible to uniquely identify the reference, i.e., either the left side or the right side.

Each Network Type and Network Type Subclass combination may have a unique set of XSP values. These are defined using XSP and Reversal Rules.