Warning system for traffic routes at an avalanche danger hillside

Abstract From the Canadian patent

A warning system for traffic routes at an avalanche danger hillside, wherein the hillside ground is divided in an assumed avalanche falling direction thus at least, approximately in gradient direction into a series of, areas which are e.g. about 30 meters wide. These areas each have at least one own indication device with an electronic signal output. The signals of the indication device are fed to the electronic interlacing circuit which for a downhill correct sequence of the signals releases or extinguishes again an avalanche alarm when by virtue of stored experience data there is or is no longer a risk on a traffic route underneath the hillside.