I'm pretty sure most of the traffic light sensors do this, no?

On 5/18/05, Jinx <joecolquitt@clear.net.nz> wrote:
> This detects vehicles magnetically with a coil
> 
> http://www.siliconchip.com.au/cms/A_102998/article.html
> 
> There are other options, depends on the actual application
> 
> Could use broken beam/reflected beam, pressure sensor/air
> pipe, shadow etc
> 
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