An oak tree on Maxwell Rd, Blenheim has split and is at risk of falling.
Traffic has been stopped while the area is being made safe by contractors and Marlborough Lines staff.
Traffic and pedestrians going south are being diverted along Stephenson St while those driving towards the central business area will have to take alternate routes.
A reporter at the scene spoke to a woman who was evactuated from her bottom storey flat on the corner of Maxwell Rd and Stephenson St.
- The Marlborough Express