TY CONF TI ASSESSMENT OF INSTRUMENTAL RECOGNIZABILITY OF RAILWAY SIGNALLING SIGNS KW signal signs KW integral moments KW clusters KW recognizability JO INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE "MANAGEMENT OF OPERATIONAL WORK IN TRANSPORT" (UERT-2022) AU Zhigalko, E.F. PY 2022 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"