WelTAG should be used at both a strategic level, to assess regional and larger transport interventions or groups of sustainable travel interventions, as well as at an individual project level.
Dylid defnyddio WelTAG ar lefel strategol, er mwyn asesu ymyriadau trafnidiaeth rhanbarthol a mwy neu grwpiau o ymyriadau teithio cynaliadwy, yn ogystal ag ar lefel prosiectau unigol.