At 15:32 7/05/01 -0600, you wrote:

This is to detect vandalism when vehicles break into a park and skid all
over the place wrecking the park for the general public. This expanse can
be 100-500 metres across. I want to minimise installation cost and use
something simple, but effective. I like the moat idea but what about the
crocodiles! No need to detect rise in water levels.

Peter
>----- Original Message -----
>From: Peter Grey <martech@OZEMAIL.COM.AU>
>
>
>> I have been reading about the pressure sensors but has anyone got a
>> suggestion for sensors that will detect if a vehicle is running across a
>> lawn or park. It need not pick up something light such as a dog or cat.
>
>Dig a moat around the place and monitor the water level for an raise when a
>car falls into it.  :)
>
>Actually, I've been looking for something similar, right now I've got an
>infrared detector over the front yard --results are still not satisfactory.
>
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