Delays on M4 London bound between J8/9 A404(M) / A308M Maidenhead and J6 A355 (Slough / Windsor). Average speed 35 mph. Travel time is ten minutes.
Snow blizzards have been causing difficult conditions on the roads in Oxfordshire, Berkshire and North Hampshire tonight.
There have been major problems along the M4 and in West Berkshire.
The problems started just before seven with heavy falls in Reading, Didcot, and Newbury.
Several centimetres of snow fell in just an hour.
Councils say gritters will be out overnight tying to keep roads clear.
Heavy snow falling near Reading causing problems for drivers on M4 eastbound.
All lanes open, accident cleared on M4 Westbound between J12 A4 (Theale) and J13 A34 (Chieveley / Newbury).
One lane closed due to accident on M4 Westbound between J12 A4 (Theale) and J13 A34 (Chieveley / Newbury). Lane one (of three) closed.
All lanes are now open, recovery work completed and broken down vehicle removed on the M4 Westbound between J15 A346 Marlborough Road / A419 Marlborough Road (Swindon East) and J16 A3102 / B4005 (Swindon West). Lane one (of three) was closed.
One lane is closed for recovery work on a broken down vehicle on the M4 Westbound between J15 A346 Marlborough Road / A419 Marlborough Road (Swindon East) and J16 A3102 / B4005 (Swindon West). Lane one (of three) is closed.
Severe delays on M4 eastbound between Membury Services and J14 A338 (Hungerford). Road blocked and queueing traffic after accident involving seven vehicles. There's congestion on the M4 to J15 A346 Marlborough Road / A419 Marlborough Road (Swindon East).
The police are on the scene and travel time is over one hour.
The M4 Eastbound is blocked, with queueing traffic due to an accident involving seven vehicles between Membury Services and J14 A338 (Hungerford).
Work to install an emergency gate on the M4 to help release traffic in the event of an accident will begin today. The gate will be installed in the central reservation of the motorway between junctions 14 and 15 between Newbury and Swindon.
The gate can be opened by the Highways Agency or the emergency services to allow drivers stuck behind the scene of an incident to turn around onto the opposite carriageway.
– Rob MacKenzie, Highways Agency project manager
"The distance between junctions 14 and 15 is around 12 miles, which means that - if an incident closes the road - a lot of drivers can become stuck on the motorway. This gate will allow the Highways Agency and emergency services to direct these drivers on to the opposite carriageway, where they can return to the previous junction and pick up the diversion route.
"This is part of our commitment to making sure that the M4, which is a vital national artery, is as resilient as possible."