Police were called to the A1 between the B645 and the A428 at 3.30am after a collision between a HGV and a pedestrian. A spokesman for Cambridgeshire police said: A woman has died following a collision on the A1 between the B645 Wyboston and the A428 this morning. A woman in her 30s was hit by a HGV on the southbound carriageway. The southbound carriageway has been opened from the A14 at Brampton Hut, Huntingdon, to the A428 turning for Eaton Socon, St Neots, but is currently down to one lane. Highways England have advised motorists to come off the A1 at Brampton Hut, junction 21, and take the A14 east and proceed to junction 24 Godmanchester. At junction 24 they should then use A1198 south to Papworth to join B1040, then follow B1040 to A428 and take A428 to A1. Duty operations manager for Highways England in the East, Ray George said: We are working closely with police to reopen these roads as soon as possible, but it is difficult to say how long that will be at this stage as accident investigation needs to take place. We would advise drivers to find alternative routes if at all possible. The road was closed northbound, earlier this morning, from the A428 to the B645 turning for Eaton Ford but reopened at around 8am. Long delays remain in the area and at the Buckden roundabout. There was also an accident on the A421 in Bedfordshire which is affecting roads around St Neots. Anyone who saw the incident or a woman walking along the A1 this morning is being asked to contact police on 101 and ask to speak to a member of the Road Policing Unit.