The A505 heading towards Royston from Baldock is closed after a tractor – which was transporting cattle – overturned.
The trailer containing the cows is blocking the road near the Litlington turn.
A police spokeswoman said: “Police were called at 3.24pm today to the A505 adjacent to the Litlington junction to reports that a tractor had jack-knifed. “The tractor’s trailer had cows on it and was blocking the road. No-one was injured and the cattle were secure in the trailer.
“A van had was also involved and had hit a post. The vehicle had to be recovered.
“Another tractor came to the scene to take the cattle trailer away.
“There was some damage to a barrier and the road surface so highways were made aware. We’re still at the scene.”
Traffic is being diverted through the villages.
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