The remains of an old reversing triangle can be seen on the Cemetery Road in Darwen, England. The triangle would have been used for trams on the now closed Darwen Corporation Tramway. As the name says the location was a turning point on the tram routes.
The Darwen Corporation Tramway was an electric tram system in Darwen, England that operated from 1899 to 1946.
Link below is a picture of the old reversing triangle
https://www.flickr.com/photos/jongraham890/7172953060/