Originally Posted By The Austrian
I drove it as a one way tunnel - at least no traffic came from the other side drive
Was somewhere between Sospel and Moulinet in France (if I don't mix things up)

Could it have been just north of the Cinque Terre ? One of your photos shows a clifftop town like Riomaggiore near there.
We went through a similar tunnel a couple of years ago and it was two way, but controlled by traffic lights as it was so narrow and went on for ages. We wondered what was happening as we sat in the queue at the lights, and people got out wandered around and had a smoke !

3w