LER is not a register of utility lines in the Danish underground, but a register of the persons and companies owning the utility lines. In 2005, the Danish utility owners registered their areas of interest in LER, i.e. the areas with utility lines. Subsequently, the register is updated on a continuous basis.
When LER was established, it became mandatory to contact the register for information of ownership of utility lines before starting a digging work in public road areas or in private common roads. The LER secretariat can then inform who owns which utility lines in a certain area.