The transport industry is calling for unrestricted movement and Covid-19 vaccination priority for its workers to put an end to the global supply crunch.

The International Chamber of Shipping has joined the World Transport Organization, International Transport Workers' Federation and International Air Transport Association in "an urgent plea" to make this happen.

"Seafarers, aircrew and drivers must be able to continue to do their jobs and cross borders, to keep supply chains moving," they wrote in an open letter on Wednesday to the United Nations' (UN) World Health Organisation (WHO).