the section from the lea interchange to leytonstone, also known as the m11 link road, was built in the 1990s in the face of a major road protest. during this work the old section as far as wanstead was rebuilt as a dual carriageway. prior to that, the a12 started at the green man roundabout at leytonstone, and was single carriageway west of wanstead underground station. it now has an underpass at that roundabout, which again is a junction with the old a11.