|Distance:||4 miles (6.4 km)|
|Meets:||A329, M4, A3290|
|Former Number(s):||Proposed as M31|
|Old route now:||A3290|
|Route outline (key)|
The A329(M) runs between west Bracknell (actually closer to Wokingham) and the suburbs of Reading, and is the only constructed section of the proposed M31. It was the last dual carriageway motorway in England to have sections with no central crash barrier; these were added in 2010. However, part of the road only has trees.
The original northern end of the A329(M) was on the A4 on the eastern edge of Reading town centre. The northern roundabout was then grade-separated in the 1980s pending construction of a northern relief road which has never been built; as such the motorway ended on an unclassified road in an industrial estate for many years.
Later still the northernmost few hundred yards of the A329(M) had its hard shoulder converted to a bus lane. As a result it was deemed inappropriate to remain a motorway and so the entire section north of Winnersh was downgraded to become the A3290. The hard shoulders have been hatched out but the road is still obviously a motorway.