Limitations on tank sizes, the segregation of oil and ballast tanks, reinforcement of the structural elements, improvements in aids to navigation, more highly qualified crews, and many other factors are involved.
Imilinganiselo kubungakanani beetanki, ukwahlukanisa i-oyile kwakunye neetanki zezinto ezinzima ezilayishelwa ukuzinzisa inqanawa, ukomelezwa kwesiqalelo sesakhiwo.