When I went to visit my uncle recently, I saw that he’d been one of the few people in the city who’d taken up the offer of having his house number set into a little rubberish triangle in the asphalt on his driveway. These things were supposed to make it easier for taxis and other visitors to see the house number - especially if the number on the letter box, for instance, was obscured by bushes.
However, I always felt that these little numbers weren’t big enough to be seen, even though, like the cat’s eyes we have in the road, they reflect light. And obviously a lot of other people had a similar feeling. The little signs never took off, and you can see only a few scattered around the city still.
An address plaque needs to be big and visible to be of use. As a former postie, I know how many people’s house number signs are under par in terms of visibility. I can say this with a clear conscience, as our house number is large. But even then, someone will miss it!