Motorway Traffic Control Centres use a range of sensors for traffic surveillance and control. The shortcomings of one type, magnetic loop detectors, has led researchers to successfully develop algorithms for alternative video sensors.
“Loop detectors have a short life span of two to three years before they break,” explains project partner Jo Versavel, General Manager, Traficon, Belgium. “They are also very expensive to repair because they involve road closings. Another drawback is that they are unreliable in congested traffic situations.”
Loop detectors consist of one or more loops of wire embedded in the pavement and connected to a control box, activated by a signal ranging in frequency from 10 KHz to 200 KHz. They are used to supply data on vehicle passage, presence, count and occupancy. Video sensors send live information to a control centre. For example, if an accident occurs, the data is sent in real time, which allows for a quicker response, decreasing the wait on the road as well as the resulting congestion.
Tara Morris | alfa
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