"A to B is Frog Pond Road, B to D is Cheviot Road - Native Dog Road, the Cheviot Tunnel is at C. If you want to check this out at some stage, I would recommend you don't ride these roads after some rain."
Not unless your on a trials bike.
I drove through this tunnel some 10 years ago when in the area with my four-by. Left home about 42 degrees ac crapped out
that morning, but do remember it being like 15 degrees in the middle of the tunnel it was one of those family days. I am guessing it has now been heritage listed that's why only foot traffic and horses are allowed.( Do wish they would clean up after themselves )
One day I'll work out how to upload some pics?