 It's NPR News. Good afternoon. With this Maine Public Radio News, I'm Patty White. Peter Mills has announced he'll step down from his role as executive director of the Maine Turnpike Authority when his term is up in September. Mills, who's 81, has served as executive director for 13 years. He says the turnpike has required constant rebuilding ever since it was constructed in 1947, and overseeing roughly 340 employees and more than 100 miles of road has been both fun and demanding.