Unable to answer "What is the widest gap one can pass through here?" – Bollard – node/4934956079 via StreetComplete 61.1:

Seems derelict to me. Would mark it as non existent, but not sure

Attached photo(s):
https://streetcomplete.app/p/288877.jpg

EP -HVT

Deze huizen zijn gesloopt, er wordt iets nieuws gebouwd

Vanaf het adres Kleinpolderplein 5 portier een met afrastering klapboom en draaihek afgesloten bedrijfsterrein van Stadsbeheer Rotterdam. Daarmee dus geen openbaar toegankelijke weg! De paarse kleur Bedrijventerrein strekt zich uit tot over de Rijksweg A20

In context of overlay "Places" – Riscure (Corporate Office) – node/7018108285 via StreetComplete 61.1:

Riscure has been bought by Keysight

dit fietspad is aangemerkt als service road maar zou volgens mij gewoon de zelfde instellingen moeten hebben als het cycle path tot aan station Maassluis west

"https://www.louwman.nl/stellantis. De vestiging is gesloten."
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2025-06-08T00:18:23Z
POI name: Louwman Schiedam
POI types: shop-car
#organicmaps android

"Is gesloten zie https://www.dijktank.nl/onze%20tankstations.htm"
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2025-06-08T00:18:23Z
POI name: Dijktank
POI types: amenity-fuel
#organicmaps android

No construction here anymore

"Permanently closed"
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2025-02-13T05:46:10Z
POI name: De Broodzaak
POI types: wheelchair-yes amenity-fast_food cuisine-vegetarian
#organicmaps android