The A11 at Thickthorn is now completely reopen after a crash which caused rush hour delays this morning.
The crash happened at just before 7am on a day when the Met Office has issued a warning of ice on the county's roads.
The crash, involving a Jaguar and a Mercedes, happened on the Wymondham side of the Thickthorn roundabout, with lanes three and four closed on the approach to the roundabout.
The road was completely reopened by 8.40am, but police warned people that heavy congestion was likely to continue and alternative routes should be taken if possible.
Queueing traffic had snaked back almost to Wymondham.
Nobody is believed to have been hurt in the crash.
There was also been a crash in East Dereham. That crash, which happened just before 7.10am, was at the junction of Baxter Row and London Road. Nobody was injured.
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