Mae’r Adran Drafnidiaeth, a hynny heb ymgynghori, wedi cyflwyno methodoleg ddiwygiedig ar gyfer eu gwaith rhagamcanu newydd mewn perthynas â chynnydd mewn traffig, a elwir yn TEMPRO 7. Er mwyn sicrhau bod y penderfyniadau ynghylch Prosiect yr M4 yn seiliedig ar yr wybodaeth ddiweddaraf, fwyaf cadarn a’r wybodaeth fwyaf diweddar mae’n rhaid i mi yn awr ganiatáu digon o amser ar gyfer adolygu’r trefniadau adrodd ynghylch y cynigion a gyhoeddwyd ym mis Mawrth 2016.
The Department for Transport have, without consultation, introduced revised methodology to their new forecasting for traffic growth, referred to as TEMPRO 7. In order to ensure that decisions on the M4 Project are based upon the most accurate, robust and up-to-date information I must now allow sufficient time for a review of reporting that supports the published proposals issued in March 2016 to be carried out.