Investigation of traffic conflicts at signalised intersections in Warsaw Piotr Olszewski, Witold Czajewski, Beata Osińska, Piotr Szagała and Paweł Włodarek MATEC Web Conf., 262 (2019) 05009 Published online: 30 January 2019 DOI: 10.1051/matecconf/201926205009