Well, that's what the writing says, and who am I to disagree.
Still, it's a Bitching road, innit. I'm intrigued to know whether the raised roadway is there to give extra time for escape if there's an eruption, or there purely because the ground is unstable. (I guess my engineering nature is showing thru' again.)
Bonus : Angry People In Local Newspapers. Ronseal, basically.