In reply to Flinticus:
There is work going on nearer the south end of the forest road that leads to the Duke's Path. Clearfell and extraction were happening when I cycled that way a week ago. No problems with access though.
All the major road construction work ,that was happening a year or two ago ,seems to be finished. There were timber stacks at the junction where a road leads up to Coilessan Glen but can't say whether any work was going on up there.
The big parking area at the end of the wee tarmac road is all clear and usable, that road being in a rather potholed state from Ardgarten.