Must You Check Under Your Car for Sleeping Kids in Denmark? Nope.

This claim has circulated online since at least 2012, when the popular Twitter/X account UberFacts tweeted it to millions of followers. From there, it was copy-pasted — without any citation — across dozens of 'weird laws' travel blogs, car rental company websites, and viral listicles, accumulating a veneer of credibility through sheer repetition.

An exhaustive search of the Danish Road Traffic Act (Færdselsloven), official EU driving guides for Denmark, the Danish Road Directorate (Vejdirektoratet) publications, and comprehensive Danish traffic law overviews finds absolutely no provision mandating a pre-departure under-vehicle check for children or anyone else. Danes themselves, when asked, consistently say they have never heard of this requirement.

The myth appears to have a close sibling: a slightly different version claims Danish law requires drivers to check their lights, brakes, and steering — and even honk the horn — before each trip. Even this version was flagged by the University of Copenhagen's own student publication, which published an editorial correction noting it appeared to be an urban myth they could not verify.

The probable kernel of truth is that Denmark, like most countries, imposes a general duty of care on drivers to operate their vehicles safely — a duty that could theoretically be stretched to cover any hazard awareness. The 'sleeping children' framing is almost certainly a sensationalized, invented version of this general principle, engineered for maximum shareability. Denmark's well-known cultural practice of leaving babies to nap unattended outdoors in prams may have also contributed to a foreign perception that unsupervised children could plausibly be found sleeping in odd locations — including under cars.