AdVerburg
barrier=low is not a valid option, because "low" not is defined as a tag value. ("your" barriers are not rendered on the map). Look for the definition of barriers / obstacles at https://wiki.openstreetmap.org/wiki/Key:barrier
In this situation I would suggest ⓐ a line (way) tagged with barrier=wall and height=0.15 and width=0.15 and colour=white OR ⓑ an area tagged with barrier=kerb and height=0.15 and colour=white
The ⓑ is used on the northern parking near Duinoord.
p.s. Bing is outdated, in JOSM (editor) more recent photos are available.