The World Economic Crisis has increased such processes as poverty, discrimination and war. As a consequence, many people from Africa, Middle East and Asia started to immigrate to Europe. There were over one million unauthorized immigrants entering Europe in 2015. However, not all countries want and can accept refugees. A long-time frame for assessing asylum applications or frequent rejections encourages refugees to migrate illegally by intruding freight transport units to cross the border of their chosen European country. The intrusion of illegal immigrants into road freight units to cross borders without being noticed has caused a great deal of damage to the international freight transportation companies. This article presents results of the study aimed at investigation of peculiarities of illegal immigrant's intrusions into road freight transport units moving along the corridor France – United Kingdom.