Ambros, Jiří, Zuzana Křivánková, Robert Zůvala, Kateřina Bucsuházy, and Jindřich Frič. 2021. “Analysis of Safety Impact of Paved Shoulder Width on Czech Secondary Roads”. Archives of Transport 60 (4): 125-36. https://doi.org/10.5604/01.3001.0015.6148.