I presume you mean having a stone 'dam' to stop the flow of gravel?
I would have thought you would need a raised barrier/ramp of stone with
angled sides to allow vehicles to climb over the barrier without a 'bump' -
a bit like sleeping policemen.
This would stop the gravel flowing out, and you would rake it back up the
slope once it reached the top of the 'dam'.
Probably easier to make in concrete than stone, but not as pretty.
As a compromise, a stone barrier with concrete ramps either side.
We've got a drive with a 1/10 slope and granite chippings - 20mm and 14mm
50:50 mix and we don't lose chippings other than odd ones that get flicked
on to the footpath by car tyres. If you can find chippings rather than pea
gravel-type stuff, you shouldn't have a problem.
If you feel that any of the above is incorrect,
Second that - there is a flat parking space up the road from us made with
gravel and cars sink in and the gravel travels all over the place.
Being round(ish) the stones tend to flow.
Angular chippings tend to compact (helped if rolled) and not move about.
Gravel (especially without sand, which really makes it ballast) is an
abomination on a drive.
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