You are here: Data Dictionary > Reference > Hierarchy

Hierarchy

Definition: Hierarchy is field of Streets (Streets) and HIERARCHY is a field of Streets for network (Routing_Streets) feature classes. It is used for Hierarchy network attribute defining. The Hierarchy/HIERARCHY field values are created using the following logic:

Order Priority Hierarchy/HIERARCHY FuncClass PREFERRED ROUTE TYPE
1 1 <Any Value> If the street has "Preferred Route Type" = Functional Class 1 Override, then "Hierarchy" or "HIERARCHY" field value is 1. Otherwise, the "Hierarchy" or "HIERARCHY" field value is the same as the "FuncClass" field value.
2 2 <Any Value> If the street has "Preferred Route Type" = Functional Class 2 Override, then "Hierarchy" or "HIERARCHY" field value is 2. Otherwise, the "Hierarchy" or "HIERARCHY" field value is the same as the "FuncClass" field value.
3 1 1 <Any Value>
4 2 2 <Any Value>
5 3 3 <Any Value>
6 4 4 <Any Value>
7 5 5 <Any Value>

The Functional Class overrides are applied when a small section of the Functional Class 1 or 2 road is restricted for Trucks. These are published based on local knowledge.

Example: The left side of the "Drechtunnel" in Netherlands is a Functional Class = 1 road and is restricted to trucks. Trucks should take the right side of the tunnel which is a Functional Class = 3 road. Functional Class = 3 roads are often not considered in route planning for long distance Transport routes. As a result, a new route, that avoids the "Drechtunnel" is planned. That route is much longer. The Functional Class override will indicate the preferred route for trucks in these situations.