Multilateral Agreement M333
  Under section 1.5.1 of ADR
  concerning driver training certificates in accordance with
  8.2.2.8.2 of ADR
  (1) By derogation from the provisions of the first paragraph
  of 8.2.2.8.2 of ADR all driver training certificates the validity
  of which ends between 1 March 2020 and 1 September 2021 remain
  valid until 30 September 2021. These certificates shall be
  renewed for five years if the driver furnishes proof of
  participation in refresher training in accordance with 8.2.2.5 of
  ADR and has passed an examination in accordance with 8.2.2.7 of
  ADR before 1 October 2021. The new period of validity shall begin
  with the original date of expiry of the document to be
  renewed.
  (2) This agreement shall be valid until 1 October 2021 for
  carriage on the territories of the ADR Contracting Parties
  signatory to this Agreement. If it is revoked before that date by
  one of the signatories, it shall remain valid until the
  above-mentioned date only for carriage on the territories of
  those ADR Contracting Parties signatory to this Agreement which
  have not revoked it.
  For the Competent Authority for
  ADR
  in the Republic of Latvia
  /Signed electronically/
  Ilonda Stepanova
State Secretary
  of the Ministry of Transport
  of the Republic of Latvia