This is the Rio-Antirro bridge, completed in 2004, and so therefore new to me on this trip. Since Rio and Patras are on the Peloponnese, which is not considered to be mainland Greece, this bridge supplements the ferries, although there have been other bridges in the past, including the one that I took when I visited the last time. It's also called the Charilaos Trikoupis Bridge, after the 19th-Century prime minister who originally proposed it.