What are these called, please?

GG and I went for a walk around Cerney House Gardens. She has a new second hand car with inbuilt Sat Nav. She wants to learn to use it, and me to help her. But then she'll disagree with it, go her own way, and then suddenly ask my advice when we're actually on a major junction!

I think I'll retire and become a librarian in the 18th century.
The garden was beautiful, though. It always is. Near Cirencester, if anyone wants to know. Ask Google Maps how to get there.