They’re Not Wires — They’re Traffic Counting Tubes
Those black “cables” are actually pneumatic road tubes, and their purpose is to collect traffic data. Transportation departments, city planners, and engineering firms use them to understand how many vehicles use a road and how those vehicles behave.
The tubes work through air pressure. When a vehicle’s tire rolls over a tube:
The tube compresses, pushing a small burst of air through the line,
A sensor box mounted on the roadside detects the pulse,
The device records the vehicle as it passes.
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