Motorists have been warned to take extreme caution in the snowy and icy conditions which yesterday brought much of Norfolk's roads to a standstill.

The warning has been issued by Norfolk police - who are urging drivers to allow extra time for their journeys today - following a series of crashes overnight in the treacherous conditions.

Numerous crashes have been reported to police on snow and ice-covered roads across the county, and officers have also been alerted to a number of vehicles have broken down or got stuck.

By 1pm police had dealt with 13 minor crashes and about eight reports of obstructions on the road, including some broken down vehicles and some escaped sheep.

A police spokesman said the collisions had all been minor incidents but warned people to take extra care when travelling.

Among the incidents that have happened are:

• Guist: A single vehicle went off the road close to the pub the Fakenham side of Guist on the A1067 at midnight.

• King's Lynn: A single decker coach went off the road and into a ditch on Queen Elizabeth Way. The incident was reported to police at 1.44am.

• Narborough: A car was in collision with a garden wall at 4am destroying most of the wall.

• Carbrooke: A car went into a ditch between the B1108 and B1077. It was reported to police at 6.17am but is believed to have happened at about 5am.

• Hevingham: A two vehicle collision next to the Marsham Arms pub at 8am.

• Trowse: A lorry jackknifed just before 10.30am on the A146 Norwich-bound at the traffic lights near the Bungay turn. The road was cleared by 10.50am. Police said the driver was not injured.

• Colney: A lorry broke down just before 10.50am on the A47.

• Harford Bridge: A two-vehicle crash on the King's Lynn-bound carriageway of the A47 between the A140 and A146 junctions just before 10.30am.

• Lenwade: A lorry and a Fiat Punto were involved in a crash on the A1067 near the Attlebridge turning just after 10am.

• Wymondham: A car went into railings at Harts Farm Road at about 1.30pm. Police said nobody was injured.

• Great Yarmouth: At the Vauxhall roundabout at the end of the A47 a car broke down at about midday.

• Stibbard, near Fakenham: A Suzuki and a white transit van were involved in a crash at 11.30am on Wood Norton Road.

• Attleborough: A 4X4 was involved in a crash at Foundry Corner at about 12.20pm.

• Pulham Market: At about 11.30am on the A140 three HGVs were stuck on a hill and one had now broken down.

• Yelverton: Police were called to reports of sheep on the A146 after they had escaped from a nearby field. The sheep were back in the field and secure by 3pm.

With temperatures plummeting to as low as -10C last night conditions remain icy today which has meant that the roads are becoming very busy with slow-moving traffic.

A police spokesman said roads are passable but drivers should take 'extreme caution' and 'drive to the conditions'.

He said: 'Drive with extreme caution, allow extra time and accept that your journey could take a lot longer than normal'.

The spokesman added police were 'extremely busy' yesterday but were 'prepared for whatever happens today'.

Between 2pm and midnight on Monday Norfolk police dealt with 49 collisions, from Midnight on Monday until Midnight on Tuesday police dealt 84 crashes. From midnight until 9.30am today there were 5 crashes.

This story will be updated throughout the day.