[Talk-GB] Modal Filters and Low Traffic Neighbourhoods

[SK53]

I've mapped a few in the way you describe going back 6 or more years ago.
An example on Mapillary here
<https://www.mapillary.com/app/?focus=photo&lat=52.968716&lng=-1.1628939999999999&z=17&pKey=-g91IVVyLUSA0vtjARyCfw>.
These have a narrow cycle 'gutter' and a much broader area with 'bumpy
paving' to provide a fire path for emergency vehicles. The RantyhighwayMan
blog has a good pos
<https://therantyhighwayman.blogspot.com/2016/12/filtered-permeability-vs-necessary.html>t
on a wide range of different designs. I think I've tagged these with
fire_path=yes, as many are signed as such, but perhaps a more explicit tag
to indicate that these are modal filters would not come amiss (e.g., as a
type of cycleway).

For filtering out these short sections in overpass you could use length :
way["highway"="cycleway"])(if:length() > 20){{bbox}} although this would
cut out short sections of other cycleways & the cutoff was rather higher
than I expected (i.e., over 10 m).

Jerry

On Sat, 10 Apr 2021 at 09:07, Steven Hirschorn <steven.hirschorn at gmail.com>
wrote:

> Hi All,
>
> Sorry, long email as there's a lot of complications here that I've been
> wondering about for a few months. I did a Google Search of the archive and
> I don't think this has been asked before. Another volunteer and I have been
> updating OpenStreetMap to include the new modal filters introduced as part
> of the government's active travel policy.
>
> If you want to see what the ones I've been mapping look like today in real
> life, I've added imagery to Mapillary, and there's an example here:
>
> https://www.mapillary.com/app/?lat=51.50207919997222&lng=-0.32299659999999997&z=17&pKey=n99sCMMhsDCVfS8jBIuNQE&focus=photo
>
> I wanted to get advice on the best way to map them? The task is partly
> complicated because in Ealing many of them have been implemented diagonally
> across junctions, turning them effectively into turn restrictions. When
> originally installed, they had a removable bollard in the middle, but this
> has been permanently removed to facilitate better emergency services access
> and to allow disabled driver (blue badge) and a small number of other
> exemptions. They are now mostly enforced by ANPR cameras.
>
> Generally, the way people have mapped them is to split the roads at the
> crossroads, joining them to make two corners highlighting the turns, and
> then adding a highway=cycleway in between to facilitate routing. Sometimes
> tags have been added for emergency=yes, horse=yes, motor_vehicle=no,
> foot=yes, and I'm not completely clear which ones are superfluous.
>
> I know we don't tag for the renderer, but one aspect I like in the way
> others have mapped them is that it makes the OpenStreetMap default
> rendering really clear about where the filters are and which route a driver
> would need to take to get to any address in the LTN, something Google and
> here.com (for example) aren't coping with very well at all. It also
> worked very well for the routers and OpenStreetMap based routers have been
> correct from day one unlike Google which still sometimes offers routes that
> are illegal (try finding a logical way to submit a diagonal filter to
> Google Maps!)
>
> What I don't like is that if I now do an Overpass query for cycleways,
> there are lots of 2 metre long "cycleways" dotted all over the map. Also
> I'm not sure if highway=cycleway & emergency=yes (because ambulances and
> fire engines are allowed to pass) is a valid combination? And is there a
> way of mapping that there are exemptions for blue badge holders? I know a
> lot of this is moot as the ambulance service use old sat navs that AFAIK
> aren't aware of emergency service exemptions, but the principle of having
> an emergency service route option as well as "car", "bicycle" and "foot"
> seems like a brilliant concept)
>
> They could alternatively be mapped as turn restrictions, but I don't think
> it's possible to make an exception for bikes, and turn restrictions
> wouldn't be visible on the map rendering.
>
> I noticed that a user, MacLondon, has added an extra tag "note:covid19"
> tags (with value "Experimental modal filter") which makes it a bit easier
> to query for the new filters if anyone wants to look for more.
>
> What do other volunteers think?
>
> Steven
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