TY CONF TI REPLACEMENT OF THE POWER UNIT IN THE VEHICLE: LEGAL ASPECTS AND SECURITY REQUIREMENTS KW Power unit KW engine KW safety KW technical expertise KW testing KW vehicle KW modification JO MODERN SYSTEMS AND TECHNOLOGIES IN TRANSPORT: PROBLEMS AND PROSPECTS AU Meshkova, A.E. AU Levina, T.A. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov