These Regulations are made in response to the danger to public health which is posed by the incidence and spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Section 45B of the Public Health (Control of Disease) Act 1984 enables the Welsh Ministers, by regulations, to make provision for the purpose of (amongst other things) preventing danger to public health from “vessels, aircraft, trains or other conveyances arriving at any place”.