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Home > How it Works > what are the two cables that lay across the road do, and how do they work?

what are the two cables that lay across the road do, and how do they work?

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-scrumpy- | 14:36 Tue 11th Jul 2006 | How it Works
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You're drivnig along the road, and you see a small black box on the verge, and two cables coming out of it that lay across the road, parallel to each other. Do they measure speed, or do they count traffic? Whichever, however do they work? How does it know I'm in a car or a 4 axle lorry?

thanks!
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Avatar Image Loosehead
Good effort Ralph but I think we are dealing with level of thickness that is impenatrable here!
12:14 Sat 15th Jul 2006
Avatar Image admarlow
SPEED = DISTANCE X TIME (er no mention of wheel size einstein!!) oh and if you need to use wheel rotation to work out speed how fast do boats go!! ha ha ha ha ha ha ha ha
20:10 Tue 18th Jul 2006

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