[talk-au] Audible fences

[Bob Cameron]

Hi Warin

Stock or pest control barriers that are somewhat replacing (and 
sometimes doubling up on) road cattle grids.

The ones I have mapped commonly comprise a fence line very close to 
(both sides of) the road edge of maybe 5-10m length and parallel, then 
two audible sonalert boxes (often with a solar panel/supply) at one end, 
or middle off the close in fence. The boxes are usually mounted on poles 
less than a metre high but I have seen some attached to the fence hardware.

Some confining fence lines I have seen are angled rather than parallel.

Any stock or pest that wants to wander through gets channelled onto the 
narrower road between the fences then blasted with sound when it gets 
within maybe 5 metres. Vehicles also set off the alarms from perhaps 
20-30m away. Some (less than 10%?) of the barriers have sound warning 
signs.

In terms of a driving hazard there is the quite loud high frequency 
sound and no road shoulder at the barrier.

Since they are becoming more and more common I'd like to see the 
consensus placed in the Aus taglines wiki

Cheers

On 1/8/21 5:32 pm, Warin wrote:
> On 31/7/21 8:59 am, Bob Cameron wrote:
>> Info only
>>
>> barrier=fence
>> sensory=audible
>>
>> ie the squeaking screeching fences that supposedly replace cattle 
>> grids. I asked for input some months ago on how to map.
>>
>> With the recent ID editor update there is now a warning that a fence 
>> has to be a line, even though it is placed on the road.
>
>
> The OSM wiki also claims a fence must be a line.
>
>
> What physically is this 'screeching fence'?
>
>
> Is it in the middle of the road like a cattle grid, or along the edge 
> of the road?
>
> A single pole with the device on it?
>
> Or is it 2 poles on opposite sides of the road with devices mounted 
> one them?
>
> Or is it a series of poles along both sides of the road with devices 
> on them?
>
>
> While for simplicity using a node on the road is good for the mapper 
> it is not good for the data consumer when used as a 'fence'. I would 
> think it is more of a different kind of 'cattle grid'. If you want 
> something that 'works' then use barrier=cattle_grid with 
> method=acoustic, assuming this will be used instead of a cattle grid 
> and possibly a replacement in future ... square peg in a round hole.
>
> Or come up with something new
>
> barrier=animal
>
> method=acoustic
>
>
> ???
>
>
>
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