In context of overlay "Bike paths" – Chaussée de Bruxelles [N275] (Secondary Road) – https://osm.org/way/350146959 via StreetComplete 57.3:

Cycle lane surface concrete

Attached photo(s):
https://westnordost.de/p/213894.jpg

In context of overlay "Bike paths" – Drève des Tumuli - Tumulidreef (Living Street) – https://osm.org/way/14501854 via StreetComplete 57.3:

Woonerf

Attached photo(s):
https://westnordost.de/p/213892.jpg

In context of overlay "Bike paths" – Rue de la Procession (Living Street) – https://osm.org/way/124916027 via StreetComplete 57.3:

Living street

Stairs

via StreetComplete 57.3

Attached photo(s):
https://westnordost.de/p/213933.jpg

In context of overlay "Bike paths" – Avenue Albert 1er [N239] (Secondary Road) – https://osm.org/way/33635073 via StreetComplete 57.3:

Bidirectional cycle track on east side, not lane. Currently closed because of road works.

In context of overlay "Bike paths" – Track / Land-Access Road – https://osm.org/way/148701382 via StreetComplete 57.3:

Should probably be a path not track

Attached photo(s):
https://westnordost.de/p/213893.jpg

Unable to answer "What type of barrier is this?" – Barrier (Unspecified Type) – https://osm.org/node/5588803850 via StreetComplete 57.3:

Bollards

sheltered, 14 stands, but v. tightly spaced, so capacity +-14

#OsmAnd

sheltered, capacity 100, wheelbenders

#OsmAnd

Area reconstructed with the main cycle path raised to higher level

via StreetComplete 57.3

Attached photo(s):
https://westnordost.de/p/213169.jpg