Black ice was blamed for many of the problems for a second morning
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Dyfed-Powys Police have been dealing with a number of road accidents on the main A40 and the A477 in west Wales.
Sheet ice following showers were being blamed for around 10 accidents officers were called to on Tuesday morning.
Many of the early morning crashes happened in the Kilgetty area and the A477 was closed between Kilgetty and Pembroke Dock but has now reopened.
On Monday the A40 in Carmarthenshire was closed for several hours after a series of accidents there.
The fire service said a van overturned, a lorry drove into a hedge and two cars collided on the A477. In an unconnected incident, another car left the road several miles away.
No one was seriously hurt.
Pembrokeshire Council said the road was gritted twice during the night, but a rain shower on Tuesday morning probably washed the salt off the road. Gritting has been carried out again.
Weather warning
There were also reports of black ice on the A40 at St Clears and problems around Caneston Bridge.
Dyfed-Powys Police were advising motorists to take extreme care on the A40 on the Whitland to Narberth stretch of road, especially at Pengawse Hill.
And police said there were treacherous conditions following black ice at Cross Hands on the A48.
The Met Office had earlier issued a severe weather warning of icy roads in south, west and north Wales through Monday night.
Monday morning's closure of the A48 forced a three-hour queue for motorists travelling westbound into Carmarthen.
A Llanelli school is closed on Tuesday because of problems with the central heating. Engineers are working on the system at Swiss Valley Primary.