DfT changed data collection methods for domestic road freight statistics (DfT) only from a paper based to online survey midway through 2021.
Ar gyfer ystadegau am gludo nwyddau ar y ffyrdd gan gerbydau domestig yn unig (Adran Drafnidiaeth), newidiodd yr Adran Drafnidiaeth o arolwg papur i arolwg ar-lein hanner ffordd drwy 2021.