From the Suffolk town of Bungay until Harleston the road follows the route of the now defunct Waveney Valley Line railway and progress along this section of the road is generally quite good as there are no reduced speed limits, save for Billingford. The road eventually intersects with the A140 Norwich to Ipswich road, just outside the Norfolk town of Diss.
The journey from Bungay to Harleston follows the former Waveney Valley Line railway route. Travel along this part of the road is usually smooth without reduced speed limits, except in Billingford. The road eventually connects with the A140 Norwich to Ipswich highway near the Norfolk town of Diss.