Vejrlig

Vejrlig is a Danish term describing weather conditions that influence road traffic and road safety. It covers precipitation, air and road-surface temperature, wind, humidity, fog and visibility, as well as pavement state such as wet, icy, snow-covered or bare surfaces. The concept is used to assess driving conditions and to guide road management and maintenance decisions.

In Denmark, vejrlig information is produced by the Danish Meteorological Institute (DMI) together with road authorities such as Vejdirektoratet (the Danish Road Directorate) and Trafikinformation. Public authorities issue forecasts and warnings about road conditions, and transport operators use vejrlig data to plan maintenance, traffic management, and responses to incidents.

Key indicators include road surface temperature, pavement condition (dry, wet, icy, snow-covered), precipitation type and amount, air temperature, wind speed and direction, and visibility. Road weather sensors and weather stations feed into traffic management centers and inform automated salt and grit distribution, plowing priorities, and speed advisories.

Seasonal considerations: During winter, vejrlig underpins salting and plowing operations and safety advisories. In other seasons, it informs risk assessments during storms or heavy rainfall and guides travel advisories. The term thus encompasses both forecasted weather and observed road conditions that influence travel decisions and transport efficiency.

See also: Danish Meteorological Institute; Vejdirektoratet; Trafikinfo.