We have a (currently gravel) 1/2 mile road. The graveling seems like a lot of ongoing maintenance, expensive over the long term, while asphalt or sprayed oils seem pretty un-green. I'm thinking maybe brick would be greenest option due to its durability, despite the embodied energy. Not sure, but brick may be prohibitively expensive, even using our own labor. What about salvaging broken concrete or other materials? Any ideas? Thanks.