Since the 19th century buried structures have been successfully cathodically protected against corrosion. For approximately the last 10 years, concrete bridges and tunnels are also increasingly being repaired by the use of cathodic protection to combat the corrosion resulting from their exposure to chloride penetration. The method has proved to be particularly successful in bridge pillars and tunnel walls. Results in the construction area in Switzerland are summarised and a survey given of the use of preventive corrosion protection in other countries.