Those look like Jersey Barriers in your example:
https://wiki.openstreetmap.org/wiki/Tag:barrier%3Djersey_barrier

On Wed, Feb 4, 2026 at 9:12 AM John Sturdy <[email protected]> wrote:

> How should we tag rows of blocks used for Hostile Vehicle Mitigation, such
> as those shown in
> https://en.wikipedia.org/wiki/Hostile_vehicle_mitigation#/media/File:Dusk_at_Terminal_3_-_geograph.org.uk_-_610450.jpg
> ?
>
> The mapping instructions at
> https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dblock show how to map a
> block barrier across a way, but not for an area.
>
> I think barrier=blocks would be suitable --- any thoughts?
>
> John
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