Bluetooth sensors used to track traffic

When every vehicle and traffic signal is connected to the cloud, municipalities and local governments should be able to have a constant view of the traffic on their streets, aware of any problems almost instantly. The catch? It's going to take a long time before there are sufficient vehicle-to-infrastructure (V2I) or even vehicle-to-vehicle (V2V)-equipped cars on our roads.

For some time, Aarhus, Denmark has been using Bluetooth sensors to collect traffic pattern information. As people drive around, emitting Bluetooth signals, the sensors log their movements around the city. In doing so, their traffic patterns can flag and reveal problems that the city needs to fix.

In addition to Aarhus, this kind of system is being used in cities in a number of European countries, as well as Thailand and Canada. It's also helping control traffic at JFK and San Diego airports. Blip Systems.