the suffolk stretch of the a12 starts with the capel st mary by-pass. originally the route from the northern end of this bypass ran through the villages of washbrook and copdock and into ipswich. when ipswich's southern by-pass was built in the early 1980s, the route picked up from the northern capel st mary junction (now numbered 32b), to pass to the west of the original line – this allowed the relevant ground works and interchanges to be completed with minimal traffic disruption. the old dual carriageway through washbrook and copdock is blocked off at white's corner and was renumbered to be the c475. a footpath still exists which enables passage underneath the a14.