Until data is available from a National Travel Survey, this indicator is measured using data on the usual method of travel to work from the labour force survey.
Hyd nes bydd data ar gael o Arolwg Teithio Cenedlaethol, mesurir y dangosydd hwn gan ddefnyddio data ar y dull arferol o deithio i’r gwaith o’r arolwg llafurlu.