Visibility in many places was down to less than 100 yards and in some spots it was as little as 15 yards. An Automobile Association spokeswoman said: "We have seen a spate of accidents, mostly caused by drivers travelling too fast."
The main problem area was in south-east England around London, although southern England, the Midlands, south Wales and the West Country were also badly affected.
On the M40 just outside London, the south-bound carriageway was brought to a virtual standstill after more than 10 separate accidents, one of which involved eight vehicles, with a tailback of 15 miles at one point. According to the London Weather Centre, similar problems were likely on the roads this morning.
Rush for the sun, page 4
Photograph: Greg Bos