No idea on the cost of this but I always thought it would be neat if we had heated roads (you can get your driveway heated). That would solve the ground visibility problem, the need for snowplows/salt and save tons of money that is normally spent on cleaning up/repairing accidents. It also might get rid of potholes caused by freezing ice saving on maintenance.
It may be done if there's a cheap mass source of e.g. geothermal energy. IIRC the main streets on Reykjavik, Iceland are heated this way to avoid cleaning snow, but that's because they're pretty much sitting on top of volcanoes.
