Originally Posted by Caliper

Sorry, no road with any level of traffic will ever keep a deep layer of loose gravel. The loose stuff mostly gets worked down into the roadbed under the weight of cars so maintaining a layer of loose gravel would be very maintenance intensive (if it got pushed aside, the drainige ditches would fill up with gravel, which they don't). Not to mention that a deep layer of loose gravel is undesirable as it gives poor traction and takes extra energy for cars as well. The point of a gravel road is that the gravel gets worked into the roadbed. This gives a fairly hard surface that also drains well and is fairly durable as long as idiots don't spin their tires and break up the top layer.