05:05AM, Wednesday 05 February 2014
Delays are affecting traffic travelling westbound on the M4 between junctions 7 and 8/9 near Maidenhead.
A police spokeswoman said there was a collision between vehicles, but no one was hurt.
The damaged vehicles have been moved to the hard shoulder but traffic is still moving slowly.
Paramedics were called to the scene of a medical emergency in Maidenhead on Monday morning (June 27).
All lines are currently blocked between Reading and London Paddington stations due to a person being hit by a train.