According to this article sensors are to be installed in Norfolk in an effort to cut the number of owls being killed by traffic. The Hawk and Owl trust will identify black spots where barn owls have been killed in the past. They will install a type of sensor at these spots that has already been trialled on moose in Sweden and the great grey owl. The sensors work by reacting to car headlights and emitting a noise that deflects wildlife away from the road. It is hoped that the noise will alert owls and other birds of prey as they hunt along the roadside verges and reduce the mortality rate of birds killed on the road.