How do those cables they string across the road measure your vehicle speed?

Question

You know those cables they lay across the road to measure vehicle speed? How do those work? Is it accurate? What is the data used for?

In: Physics

Answer 1

if I am thinking about the same cables you are thinking about they aren’t used to measure speed they’re used to count how many cars are going across the road they use it to know how much maintenance or if they need to expand the road to handle more traffic.