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Myanmar does not grant traffic rights to foreign road freight vehicles even during normal times. Transloading takes place at designated border zones. On 19/3/2020, the Myanmar government announced the temporary suspension of entry and exit of foreign nationals through land borders.
Source: https://mm.usembassy.gov/covid-19-information/
Major ports continue their operations with some precautions in fighting the pandemic. Myanma Port Authority requires 72-hours advanced notice from all ships arriving in Yangon and all crew members to undergo medical check-ups before docking. Source: https://www.mmtimes.com/news/yangon-port-orders-72-hour-notice-arriving-ships.html