The names of these and other fictional locales from literature were seamlessly added to road signs by an artist/prankster using Transport Medium, the official font of British road signs.
After some sleuthing, BBC News found the man responsible, who spoke to the outlet on the condition of anonymity. He told the BBC that he's been orchestrating "creative interventions" all over England for about 20 years under different pseudonyms, and that this project was a reaction to Didcot being labeled "the most normal town in England" in 2017, which rubbed him the wrong way. "To me there's nowhere that's normal, there's no such thing, but I thought I'd have a go at changing people's perceptions of Didcot," he said of the town, which he describes as a "fun" and "funky" place.
Oxfordshire County Council isn't laughing; it told the BBC that although the signs were "on the surface amusing," they were "vandalism" and potentially dangerous, since it would be hard for a driver who spotted one not to do a double take while their eyes were supposed to be on the road. Even so, thanks to routine council matters, the signs are safe—at least for now—as the Council says that it is prioritizing fixing potholes at the moment.
Jackie Billington, Didcot's mayor, recognizes that the signs have an upside. "If you speak to the majority of people in Didcot they're of the same opinion: it's put Didcot on the map again," he told BBC News. "Hopefully they'll be up for a couple of weeks."
There are five altered signs in total. If you fancy a visit to the Emerald City, you're pointed toward Sutton Courtenay. Narnia neighbors a power station. And Gotham City is on the same route as Oxford and Newbury (and not, apparently, in New Jersey, as DC Comics would have you believe). If you want to go see the signs for yourself before they disappear, you'll find them along the A4130 to Wallingford.
See the signs here and in the video below.
[h/t BBC News]