Electronic surveillance of the state of highways for the purpose of winter maintenance. Saisie électronique de l'état des routes pour l'entretien hivernal.

In Switzerland safety on routes with a major flow of traffic gives rise to problems mainly in winter. A system for black- ice detection (SDV), intended to supplement local weather forecasts for early detection of impending snowfalls and, in particular, the formation of black ice. The objectives of the SDV are: - to increase highway safety in winter: - to reduce the volume of chemical melting agents and hence expenditure and environmental pollution.