You still don't understand the problem with winter and a highway system with power terminals built in. For one, in a big snow, sometimes they don't scrap all the way to the pavement. Many storms I've had to drive somewhere and the road had a couple inches of packed snow. Nothing is making contact with some power terminal built into the road. But the bigger problem is the amount of damage done to the road from the ground freezing, water seeping into cracks and freezing, and heavy plows scraping the roads. Here in the mountains, when winter is over, potholes are everywhere.