the a12 is a major road in england. it runs north-east /south-west between london and the coastal town of lowestoft in the north-eastern corner of suffolk, it follows a similar route to the great eastern main line. a section of the road between lowestoft and great yarmouth became part of the a47 in 2017, and this forms part of the unsigned euroroute e30 (prior to 1985 it was the e8). unlike most a roads, a significant portion of the a12 (together with the a14 and the a55) has junction numbers as if it were a motorway.