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Cellular Geo-location - This experimental technology can collect
travel time data by discretely tracking cellular telephone call transmissions.
Cellular telephones are also useful to collect travel time data.
Two techniques have been applied using cellular technology: cellular telephone
reporting and cellular geolocating.
Cellular Telephone Reporting
An operator at the central control facility records each driver’s
identification, location, and time, by monitoring the time between successive
telephone calls, travel time or travel speed between reporting locations are
determined.
It is useful for assessment of current traffic conditions and for collecting
travel time data during delays or accidents.
The cellular telephone reporting method is recommended for short-term studies
with low accuracy requirements.
Cellular Geo-location
The cellular geolocating methodology discreetly tracks cellular telephone calls
to collect travel time data and monitor freeway conditions.
This technique utilizes an existing cellular telephone network, vehicle locating
devices, and a central control facility to collect travel time data.
All vehicles equipped with cellular telephones are potential probe vehicles.
The system automatically detects cellular telephone call initiations and locates
the respective probe vehicle within a few seconds.
Advantages
- Driver recruitment not necessary
- No in-vehicle equipment to install
- Large potential sample
Disadvantages
- Low accuracy
- Privacy issues
- Infrastructure dependent
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