WelTAG is the Welsh Transport Appraisal Guidance, providing the framework for decision making and good practice for the development, appraisal and evaluation of proposed transport interventions.
WelTAG yw’r Arweiniad ar Arfarnu Trafnidiaeth Cymru, sy'n darparu'r fframwaith ar gyfer gwneud penderfyniadau ac arferion da ar gyfer datblygu, arfarnu a gwerthuso ymyriadau trafnidiaeth arfaethedig.