The second largest city in Denmark has been using Bluetooth sensors for a few years now. The sensors are placed strategically around the city to allow city officials to see real-time traffic information including driving times, speed, dwell times and flows. If traffic becomes a problem in one zone, the system will raise a flag. Aarhus officials will both know where the current traffic issues lie and can look back on historical data for assessing future traffic improvements.

“We now discover errors and irregularities that we would not have a chance to see otherwise. In addition, it is extremely educational and easy accessible to study how the incidents of various kinds influence the road network,” said Asbjørn Halskov-Sørensen, ITS project manager at Aarhus Municipality.

Aarhus is now looking to combine this system with other surveillance data they have to get even more accurate traffic alarm mechanisms. In addition to improving traffic, Bluetooth sensors are being used to help visually impaired individuals navigate cities.

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