https://www.thetimes.co.uk/article/clever-cats-eye-filters-suck-up-car-exhaust-fumes-6rfx5mtft?shareToken=7b115d8167545e6d7988722da21ee 9e7

Extract:

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 as
well as nitrogen oxides generated by engines.

It has been developed by Pollution Solution, a Hertfordshire-based company
that plans to sign deals with highways contractors to use it in
high-pollution areas. It is negotiating with a local authority to initially
install it in east London, where it would target areas where vehicles sit
with idling engines, such as outside schools or at traffic lights,
pedestrian crossings and busy junctions.

The technology, which costs about £60,000 to install, works by cutting a
small channel in the middle of the road. A series of pod heads similar to
cat’s eyes sit slightly above the surface and are connected by pipes to a
roadside air station the size of a large bin.

When cars stop, they trigger a roadside sensor and fans pull in particulate
matter, as well as toxic gases such as nitrogen oxides from exhausts. The
matter is collected in a filter while the nitrogen oxides are treated and
leave the system as 99 per cent clean air, the company said. It can run
fully or partly on solar power. The plans come amid growing public concern
about air pollution, which is believed to cause an estimated 40,000
premature deaths a year.

… continues

In message , at 10:48:31 on Mon, 9 Dec 2019,
Recliner remarked:
https://www.thetimes.co.uk/article/c...s-suck-up-car-
exhaust-fumes-6rfx5mtft?shareToken=7b115d8167545e6d7988722da21ee 9e7

Extract:

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 particulate
matter,

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

On 09/12/2019 11:15, Roland Perry wrote:
In message , at 10:48:31 on Mon, 9 Dec 2019,
Recliner remarked:
https://www.thetimes.co.uk/article/c...s-suck-up-car-
exhaust-fumes-6rfx5mtft?shareToken=7b115d8167545e6d7988722da21ee 9e7

Extract:

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
particulate
matter,

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

Some years ago there was suggestion that the collection of roadside
dirt would be a profitable source of various metals as they can be
present in what would be considered economically viable percentages in
ore samples. So such a fan system could be self-financing.

--
Graeme Wall
This account not read.

In message , at 12:32:22 on Mon, 9 Dec 2019,
Graeme Wall remarked:
On 09/12/2019 11:15, Roland Perry wrote:
In message , at 10:48:31 on Mon, 9 Dec
2019, Recliner remarked:
https://www.thetimes.co.uk/article/c...s-suck-up-car-
exhaust-fumes-6rfx5mtft?shareToken=7b115d8167545e6d7988722da21ee 9e7

Extract:

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

Some years ago there was suggestion that the collection of roadside
dirt would be a profitable source of various metals as they can be
present in what would be considered economically viable percentages in
ore samples. So such a fan system could be self-financing.

How many dustbins worth of the dirt do you think would be needed to
recoup the 60k installation cost (let alone the ongoing collection
costs).
--
Roland Perry

On 09/12/2019 13:44, Roland Perry wrote:
In message , at 12:32:22 on Mon, 9 Dec 2019,
Graeme Wall remarked:
On 09/12/2019 11:15, Roland Perry wrote:
In message , at 10:48:31 on Mon, 9 Dec
2019,Â* Recliner remarked:
https://www.thetimes.co.uk/article/c...s-suck-up-car-

exhaust-fumes-6rfx5mtft?shareToken=7b115d8167545e6d7988722da21ee 9e7

Extract:

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
Â*...

When cars stop, they trigger a roadside sensor and fans pull in
particulate
matter,
Â*I doubt that stationary cars create much in the way of particulate
fromÂ* their tyres and brakes.

Some years ago there wasÂ* suggestion that the collection of roadside
dirt would be a profitable source of various metals as they can be
present in what would be considered economically viable percentages in
ore samples.Â* So such a fan system could be self-financing.

How many dustbins worth of the dirt do you think would be needed to
recoup the 60k installation cost (let alone the ongoing collection costs).

Depends how much you want to pay other people to dig it out of the
ground instead. Actually the original suggestion was much more low-tech.
In the days when councils could afford to send out road-sweepers it was
reckoned a viable proposition as the dirt was being collected anyway.
I'm assuming similar economics could apply here.

£60k seems remarkably cheap for such an installation or perhaps I'm just
getting jaded.

--
Graeme Wall
This account not read.

Roland Perry wrote:
In message , at 10:48:31 on Mon, 9 Dec 2019,
Recliner remarked:
https://www.thetimes.co.uk/article/c...s-suck-up-car-
exhaust-fumes-6rfx5mtft?shareToken=7b115d8167545e6d7988722da21ee 9e7

Extract:

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 particulate
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.

In message , at 14:38:46 on Mon, 9 Dec 2019,
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 particulate
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.

On the bit of road they slowed down, not the section they are
stationary.
--
Roland Perry

On 09/12/2019 14:55, Roland Perry wrote:
In message , at 14:38:46 on Mon, 9 Dec 2019,
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
particulate
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.

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.

--
Graeme Wall
This account not read.

Roland Perry wrote:
In message , at 14:38:46 on Mon, 9 Dec 2019,
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 particulate
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.

On the bit of road they slowed down, not the section they are
stationary.

From the picture, there's a row of air inlets between the lanes. They're
not relying on precisely lining up with the stationary vehicle.

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, 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
particulate 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.
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.
--
Roland Perry