Traffic Volumes
The department is responsible for the effective management and efficient operation of all state government roads.
Before it is possible to plan improvements to the road system, it is important to understand how people currently use the existing network of roads.
Traffic volume information is an important indicator of how the network is used.
The two map series currently available show:
- Annual Average Daily Traffic (AADT) estimates
- Heavy Vehicle estimates.
These maps cover both the rural and metropolitan areas of SA.
The AADT estimate represents the total volume of traffic (that is, the sum of traffic travelling in both directions on a two-way road) passing a roadside observation point over the period of a full year, divided by the number of days in the year.
Heavy Vehicle traffic estimates represent the average daily two-way volume of these vehicles, and are expressed on the maps as both an absolute number and a percentage proportion of the total traffic flow. Heavy Vehicles are defined as vehicles included in Classes 3 to 12 inclusive of the AUSTROADS vehicle classification system.
In general, these maps show traffic estimates only for sealed roads that are maintained by the department. However, estimates are progressively being provided for certain outback unsealed roads whose management is also the responsibility of the department.
To achieve a reasonable balance between accuracy and practicality, the road network has been broken down into a series of "traffic estimate sections". These are defined as discrete sections of road where the actual values of traffic volumes anywhere along that section are unlikely to vary by more than 10-15 per cent from the value shown on the map for that particular section.
The information represented on this map series is derived from a comprehensive database which facilitates the integration of various data sources.
Rural Traffic Estimate Maps
Select map type: Total Traffic Heavy Vehicles
Select an area on the map below to view or from the table:
To print the whole set, or a sub-set, of the rural traffic volume maps, click on one of the following links and select the pages of interest.
Metropolitan Traffic Estimate Maps
Select map type: Total Traffic Heavy Vehicles
Select an area on the map below to view or from the table:
To print the whole set, or a sub-set, of the metropolitan traffic volume maps, click on one of the following links and select the pages of interest.
