What are the black "ropes" that are laid out across a road?

Question:
You know the kind of rubbery ropes that go across a road?

IS 250 or TSX or A4? n why?

I've heard that they somehow measure the amount of traffic that passes, and that it measures speeds.

I just got home, there was dense fog on the two lane road I was on?

Anyone have an idea?

Answers:

Which one - Truck lift? Magnaflow exhaust system? or Cool Rims, (04 Taco)?

i own a repair shop and these are called traffic counters ,they count how many cars travels a road in one day or a week,and this tells them that this road may need service work done on it more often than others do,they usually leave one up on any road for about a month,and see how many cars use that road ,and then they will decide when to re-surface it based on that information,good luck i hope this has explained it good,maybe it will help.

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They're hoses, and they measure the number of axles that cross over them, by pumping a counter. Divide #/axles by two: that's your traffic count.

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They are rubber hoses. When a car passes over them it causes a presure in the hose and that will make a counter. The dept of highways can measure how much traffic a road gets by checking the count.

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usually those are used for measureing how much traffic is on that road so they can co-ordinate enough road crew to do paving or whatever else they might want to do with the road.

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And back in the old days they were used to ring a bell at the service station so the guy would know when he had a customer

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These are sealed hoses and when a vehicle runs over them, the air pressure trips a traffic counter...That's all they are used for nowadays, to guage how much traffic is on that road.
Before radar a similar system was used to guage speed, it was used in the 40's and into the 50's...

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They are snakes.

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You are right they check the amount of traffic for certain areas at different times.

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