Denmark

Allux mailboxes, manufactured in Odense, are popular nationwide. Their rounded lids are distinctive (Image Source) . You can also find them in mainland Germany and the Faroe Islands, which are part of the Kingdom of Denmark.

Rounded tubular posts are everywhere—street-name signs use the same tubing. In contrast, places like the Netherlands often use square tubing. The suffix -vej literally means “road” in Danish (参考文献 vej).

Bollards feature yellow reflectors with red stripes . The orange tape at the top can peel off, so do not rely solely on that(Image Source) .

Street names commonly include vej, høje, or haven .

Flagpoles in front yards are common, and families often raise the flag for holidays or birthdays (参考文献 Quirks of Denmark). The flags themselves are very narrow .

Yellow plates exist, so do not confuse them with the Netherlands .

Bornholm road signs almost always mention “Nexø” or “Rønne”, even on small cycle-route signs (参考文献 Rønne - Wikipedia).

Læsø is known for traditional timber houses(by Geotips ). Look for place names such as Byrum, Vesterø Havn, or Østerby Havn on the signs .

The eastern side of Anholt Island is a sandy desert with very few roads . Even where roads exist, sand often piles up or the surface itself is sandy .