There's one section of the A303 near me which is supposed to be the last of those three lane roads to be built (according to local legend).
It was still three lane when I moved here 20 years ago, but after one particularly nasty incident, they changed it so that the middle lane is in one direction for about a mile or so, then swaps, with double whites the whole way.
My dad always used to refer to the lanes as nearside, offside and suicide.