More like 1-10 years. And the snow plover destroy the surface of the roads, so you can't mount some device on the road surface or just beneath the surface. Even

More like 1-10 years. And the snow plover destroy the surface of the roads, so you can't mount some device on the road surface or just beneath the surface. Even the sticks net to the road get destroyed from time to time by trucks or snow plovers.