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Old December 9th 19, 05:59 PM posted to uk.transport.london
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Default Cats' lungs

On 09/12/2019 17:23, Roland Perry wrote:
In message , at 15:08:14 on Mon, 9 Dec 2019,
Graeme Wall remarked:
On 09/12/2019 14:55, Roland Perry wrote:
In message , at 14:38:46 on Mon, 9 Dec
2019,Â* Recliner remarked:
Vehicle pollution will be sucked out of the road under plans to
install
cat’s eye-style filters at the most toxic junctions.

Technology has been developed that uses low-energy fans between
lanes to
pull in exhaust fumes before treating the pollution at the roadside.
Initial tests suggest that it can remove an average of 30 per cent of
dangerous pollutants, including fine particles from brakes and tyres

...

When cars stop, they trigger a roadside sensor and fans pull in
particulateÂ* matter,

I doubt that stationary cars create much in the way of particulate
from
their tyres and brakes.

The process of slowing down certainly will have done, so there will be
local clouds of particulates to suck in.
Â*On the bit of road they slowed down, not the section they are
stationary.


I would assume they would use the basic vehicle detectors to check
whether a car is there, either mobile or stationary. Relatively easy
to incorporate into any existing signalling system at the junction.


But why only suck the airborne particulates from the stationary ones,
which was the article was suggesting. The ones driving past, or braking
a few hundred yards back where perhaps there's no suction, will be
generating more.


I suspect you are reading too much into a non-specialist journo's
misinterpretation of the idea. If the whole lot is only £60k then that
doesn't imply a lot of fancy motion and speed detectors to establish
whether a vehicle is moving or stationary.

--
Graeme Wall
This account not read.


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