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What are those black rubber hoses for any way?

 
 
parados
 
  1  
Reply Fri 20 Nov, 2015 01:54 pm
@Linkat,
If they are determining traffic volume on a street, they don't need to be at an intersection. By counting traffic on several streets they can tell where and how traffic is moving so they can come up with plans to disrupt improve traffic flow.
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