The average speed information is provided in both directions of a road link, named A and B in the attributes. The Direction attribute informs you if the speed information applies to both directions of a road link or if it applies to one-way road links. When the speed is provided only within an “A” attribute means the speed applies to one-way road links and the direction values indicates if the speed applies in the direction or against the direction of digitisation. The table below describes the codes which will be used to populate this field and the description for each code.
| Code | Description |
|---|---|
0
The speed information applies to both directions of the road link.
1
The speed information applies to a one-way road link and is in direction of digitisation of the road link (A>B direction).
-1
The speed information applies to a one-way road link and is against direction of digitisation of the road link (B>A direction).
A code list or enumeration is a controlled set of values which can be used to populate a specific column.