Joe wrote:

Aidan wrote:


Joe wrote:

Has anyone actually used this for a drive?



No, but I know a man who has.

http://www.pavingexpert.com/stonpv01.htm

Yes, an excellent site, but fairly noncommital on this subject. Only
seems to endorse 100-150mm stone for vehicular use. This seems excessive
to me.

The key is to support it fully on a wet mortar base over a rigid sub-layer.