Signed, preferably in brown (though special symbols like the Wild Atlantic Way's \/\/\/\/ (WAW) waves would count), seems reasonable.
I'm likely going to purge the one-way tours (eg Kent and Sperrins), little forest drives along tracks, and connect-the-dots circles (eg Black-and-White tour, which links villages with black-and-white houses). But at the moment, I'm leaving them in until I've made sure they are well documented elsewhere.
I'll leave it to you whether
the lower Saxony Asparagus route is a valid entrant - it's a circular connect-the-dots style theme route, but it's also one of those
Ferienstraße that have some official status like Scotland's National Tourist Routes, or Norway's, etc.