Was reading an article on the BBc Europe site about several Municipalities in The Netherlands considering using geo-thermal energy to heat bike lanes in the interests of cyclist safety.
Heating road surfaces is nothing new in BC. The 10th St underpass in Kamloops, BC (where I live) and several structures, including the snow shed (avalanche gallery to our European members), have all had elements, similar to that found in a typical oven. Those however, were electric and cost a fortune to operate, despite the effectiveness at keeping the road surface (bridge decks) ice free.
Linky to the article here: