Just to point out that the M4 is going to be closed between J11 and J12 (Westbound) on Tuesday from 10pm.
Obviously anyone looking to head west is going to need to find another route. I'm not sure if it will cause extra traffic in general as people are diverted off the M4 down the A33.
http://www.getreading.co.uk/news/readin ... y-12593220