2Scope#
The scope of traffic sensors covered in this document are for the following applications.
2.1Vehicle detectors#
Vehicle detectors are used to measure vehicle flow, occupancy, headways, speed and length. A vehicle detection site is to consist of a STREAMS-supported vehicle detector and associated sensors that are capable of accurately measuring these parameters. One-minute data is used by the following STREAMS applications:
- ramp signalling
- incident detection
- traffic signal control
- coordination plan selection
- travel time data
- Variable Speed Limit (VSL), and/or
- Vehicle Activated Signs (VAS)
2.2Traffic counter / classifier#
A traffic counter is used to automatically collect traffic volume counts of motorised vehicles. A classifier is a traffic counter which is capable of classifying the counting targets by types.
A vehicle classification site consists of a vehicle classifier and associated sensor arrays. The site can classify a vehicle either by axle configuration in accordance with the Austroads vehicle classification scheme, or by vehicle length per the department's length classification scheme.
Data collected by traffic counter / classifier reside locally within the device, until the device is interrogated to transfer data to a departmental database.
2.3Weigh-in-motion#
A high-speed WiM site consists of a WiM logger and associated sensor arrays. The site can weigh the dynamic weights of individual axles of a vehicle, while the vehicle is moving at normal travelling speeds.
2.4Active transport counter / classifier#
An active transport counter is used to automatically collect traffic volume counts of active transport participants. Counter can be dedicated for specific types of active transport events, for example, bicycle or pedestrian.
An active transport classifier is a counting device capable of distinguishing different counting targets, these include bicycle, scooter, and pedestrian recognition in a common detection zone. The classifier also reports the volume of undetermined events.
Data collected by active an transport counter / classifier reside locally within the device, until the device is interrogated to transfer data to a departmental database.