Last winter I finally ran out of 4" PVC that I used to fit over my 5' rear blade to push snow on gravel. This year, I tried a piece of stall mat as many here have recommended. I gotta say it works great. I've since removed the stall mat as there's 3" of ice over the gravel now, thanks to a couple rounds of freezing rain. If anyone is looking for an alternative to keep gravel in place, stall mat is the way to go!