Mae copi o'rAdroddiad ar Astudiaeth Cam 1 Arfarnu Trafnidiaeth Cymru (WelTAG) ar Gydnerthedd yr A55i'w weld ar-lein yma.
A copy of theA55 Transport Appraisal Guidance (Weltag) Stage 1 Resilience Study Reportis available to view online.