In reply to KatieB:
The Dentelles massif is private land and the owners have decided to close it to vehicle access. To climb on the Gigondas crags you have to park at les Florets and walk whereas previously you could park at the col de Cayron. The only reason access to the Clapis crags might be banned is if there is high fire risk which there was for a lot of last summer. Of course in those conditions access on the Gigondas side would be banned as well.
I guess the time to walk up to the col de Cayron is in the region of 10 - 15 minutes.
Post edited at 09:41