Although the raster maps at maps.atownsend.org.uk support zoom levels up to 24, until recently I’ve not made much use of that for showing extra data. However, there is a lot of room at these high zoom levels - as the picture above shows, enough for all the directions on this signpost here.

The name is shown as normal at lower zoom levels, then as you zoom in the directions are shown too, as you can see here.