However, you may not have factored in the cost of maintaining a gravel driveway, which could increase your initial evaluation considerably. On the flip side, there's a recycled material you might not have come across that is actually far sturdier than gravel and requires much less upkeep, perhaps making it a wiser investment to begin with. It's known as steel fiber-reinforced concrete, and you can save some money if you opt for the use of recycled fibers. Recycled steel fiber-reinforced concrete uses steel fibers from end-of-life tires (ELTs) to reinforce the concrete instead of rebar. Of course, once laid, a concrete driveway is going to stay put and provide a nice, solid drivable surface, unlike gravel.