In the UK, as indeed in other European countries, double yellow lines are for parking restrictions, close to the gutter, by the pavement/sidewalk. Double white lines are the equivalent "do not cross" of your double yellows. We tend to use the term "crash barrier" for anything that generically stops you from driving over the central reservation.
Good analogy though. Like it!
Oh Lord, won’t you burn me a Knoppix CD ?
My friends all rate Windows, I must disagree.
Your powers of persuasion will set them all free,
So oh Lord, won’t you burn me a Knoppix CD ?
(Missquoting Janis Joplin)