The Highways Agency said normal traffic conditions would not return to the M4 until 2300 GMT.
At that point the Welsh government wants to take control of the M4 and M48 crossings.
BBC: M4 relief road: No tolls planned, Welsh government says
The Bushmaster M4 Types Carbine, a semiautomatic rifle, uses a 20 or 30-round magazine.
Hazardous driving conditions were reported along the whole of the M4 in south and west Wales.
BBC: Wales snow: Hazardous road conditions as snow moves west
The M4, where traffic travelling into London is moving slowly between junctions 2 and 3.
The tolls are charged on both the M4 and M48 motorways as vehicles cross into Wales.
BBC: Welsh MPs suggest ?1.50 Severn Crossings tolls for cars
The Slovakian made an 11th-hour dash down the M4 after first-choice keeper Adriano Basso pulled out.
M4, rose to 13.7% in the year to August, its fastest pace in almost 16 years.
The M4 eastbound has reopened at Newport after an earlier crash in which a 67-year-old man died.
BBC: Heavy traffic on the M4 between J28-29 on Friday morning
Part of the M4 was reduced to one lane overnight after a lorry jack-knifed near Swindon, Wiltshire.
Snow blocked one lane of the M4 between Bridgend and Pyle in both directions late on Wednesday afternoon.
The M4 is shut between junctions two and three and is not expected to reopen until Thursday morning.
We're the only contender from the South West and probably one of the only contenders south of the M4.
Eleven people have been injured after a four-car crash on the M4 in south Wales shortly after a hailstorm.
The business groups said the M4 relief road would have created a strategic route into the south Wales economy.
Many major roads are being affected by snow, with parts of the M4 and M50 closed for a time.
Plans were announced in 2004 for a 14-mile road to ease congestion on the M4 around Newport, between junctions 23 and 29.
The idea of a new hospital near the M4 in Berkshire has been "warmly received", an MP has said.
Dr Lee believes a hospital near the M4 could serve 650, 000 patients in south Buckinghamshire, Berkshire and south Oxfordshire.
Employers' group the CBI has called a relief road to ease congestion on the M4 near Newport a "clear priority".
The road supports plans for nearly 2, 400 new homes and a science park south of the M4, creating 780 jobs.
BBC: Shinfield eastern relief road to be built with ?25m loan
The broadest measure of money available today (CFS Divisia M4) gained 6.9% in December 2012 on a year-over-year basis.
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M4 measure of money has been rising by over 10% a year since March 2005, most recently by almost 13%.
And a 50mph speed limit is in place on much of the M4 in south Wales due to surface spray.
BBC: Flooding: Heavy rain could spark more floods, agency warns
The A470 is shut between Merthyr and Brecon and the M4 is shut between junctions 22 and 23 in both directions.
You will remember that 18 months ago, the chancellor promised to work with the Welsh government to improve the M4.
Police in south Wales said driving conditions on the M4 had been made dangerous by the excess water on the motorway.
She doesn't hide the fact that at this end of the M4, there is no Lib Dem support for regional pay.
The v4 SSD joins the m4 SSD and Adrenaline Solid State Cache Solution to round out the award-winning Crucial SSD portfolio.
ENGADGET: Crucial outs v4 SSD for solid-state storage on a budget
But it does lie on the M4 corridor, a cluster of high-tech firms that includes several names familiar from Silicon Valley.
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