Grabowski, Ryszard J. “Turbo-Roundabouts As an Alternative to Standard Roundabouts With the Circular Centre Island”. Roads and Bridges - Drogi i Mosty 11, no. 3 (April 1, 2012): 215–231. Accessed July 12, 2024. https://rabdim.pl/index.php/rb/article/view/v11n3p.