There are 8 roads (9 different routes as the A40 is split into two sections) on the TERN route, 5 of which are in South-East Wales and 4 of which are in South-West Wales.
Mae 8 ffordd (9 llwybr gwahanol gan fod yr A40 wedi cael ei rhannu'n ddwy ran) ar lwybr y Rhwydwaith Ffyrdd Traws-Ewropeaidd.