@ SenorMysterioso - that's true, a complete double arch is rare, but I've seen more than one of them here too. I had a weird rainbow experience a few weeks ago, when a friend and I drove right through the end of one - I didn't think it was possible. We couldn't actually see any colour when we were in it, but we did right up until a few metres from it. We squealed like piglets as we drove through!