Correlation analysis of factors affecting piggyback transportation in Uzbekistan Ziyoda Mukhamedova, Gulshan Ibragimova, Altinbek Tulayev, Shohrukh Kayumov and Adylkhan Kibishov E3S Web Conf., 515 (2024) 01002 Published online: 12 April 2024 DOI: 10.1051/e3sconf/202451501002