“Fodd bynnag, bu achos difrifol yn ddiweddar lle methodd uniad pont yn rhannol ar yr A55 ychydig i’r gorllewin o Landdulas. Bu’n rhaid i ni greu pecyn o waith brys er mwyn sicrhau cyn lleied â phosibl o effaith ar yr A55 petai’r uniad hwnnw’n methu’n llwyr. Rydym felly’n gosod man croesi yn y llain ganol ym Mhont yr Enfys. Mae hyn yn gwbl hanfodol oherwydd byddai methiant yr uniad yn golygu cau cerbytffordd y gorllewin yn llwyr. Trwy osod y man croesi newydd gallwn roi gwrthlif ar waith ar gerbytffordd y dwyrain. Byddai methiant o’r fath yn achosi cryn oedi a heb groesfan yr unig opsiwn fyddai dargyfeirio’r holl draffig, pob awr o’r dydd, i’r hen ffordd o Landdulas i Fae Colwyn (byddai hyn yn creu tarfu tebyg i’r hyn a welwyd yn sgil digwyddiad y tancer cemegau y llynedd, ond am gyfnod llawer hirach).
“However, the A55 recently suffered a significant partial failure of a bridge joint just west of Llanddulas.  We have had to put together an emergency package of works to minimise the impact on the A55 should that joint fail completely.  We are thus installing a full central reserve crossover at Rainbow Bridge.  This is vital, as any further failure of the joint, which would require immediate and full closure of the westbound carriageway, would allow us to effect contraflow on the eastbound carriageway.  That would cause significant delays in itself, but without the crossover the only option would be to divert all traffic, 24/7, onto the old road from Llanddulas to Colwyn Bay (which would result in disruption similar to that caused by last year’s chemical tanker spill but over a much longer period).