I've got a curb ramp at bottom of my driveway that I want to fill so I can drive up it without slowing. The usual fixes are to fill the dip with concrete, asphalt, lumber, a rubber ramp, metal ramp, or rubber/adhesive product (like curbramp.us). My town doesn't allow curb ramps, but rarely enforces the rule. The curbramp.us product is removable and is reasonably priced (about $155 for 14' long), but its rubber so probably needs maintenance. But that got me thinking -- could I just use a "road base" product (mix of gravel & crushed rock aka fines). I have no water running down my curb, it all drains away from driveway, so erosion from water not really a problem. As it wears away I suspect adding some road base then packing would fix. And if city made me remove the road base it would be easy. Anyone seen info on this?
If you use crushed rock or asphalt road mix, I would like to see you put a piece of perforated 2" Sch-80 PVC pipe at the bottom of the 'V' to catch and provide a conduit for run-off. The road mix is designed to react to pressure and heat. It would help if you could bring in a roller.
I like the rubber 'curb ramp' idea. I think it would be the most stable; and result in fewer down sides. A good engineering project would be to design and build a bridge. Build a interlocking trestle.