Both drivers got out of their cars uninjured after the crash on the westbound carriageway shortly after midday. A police spokesman said there was a minor blockage but no closure was put in place. An ambulance from the East of England Ambulance Service Trust attended and a spokesman said the occupants got out of the vehicles themselves and neither were taken to hospital. The A1 southbound carriageway near St Neots is closed after a serious incident at Biggleswade. The road is expected to reopen at 9pm and delays of up to 30 minutes are expected leading up to St Neots.