A lane closure between A329(M) Reading and A33 Whitley Wood is seen to be causing slow traffic this afternoon.
Between junction 10 and junction 11 on the M4 westbound near Reading, long-term construction which has closed one lane is underway.
AA Live shows that traffic has slowed significantly on this section of road where only three lanes are available.
Lane one of four has been blocked off for major improvement and upgrading works.
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