Police are appealing for witnesses or anyone with dash cam footage following a collision in Chafford Hundred.
A blue Skoda Octavia and a grey/silver Audi A6 were in collision in Flemming Road at around 9.15pm on Saturday May 2.
The passenger in the Skoda was taken to hospital where they required surgery on multiple injuries while the driver was injured, but their condition is not described as life-threatening or life-changing.
The driver of the Audi is also being treated in hospital while the passenger from that car has sustained a broken collar bone and internal injuries.
Police are urging anyone who saw the collision or has dash cam or CCTV footage to come forward.
In particular they are keen to speak to anyone who witnessed how the Audi was being driven in the moments leading up to the incident.
If you have any information please call 101 quoting incident 1035 of 2 May or Crimestoppers anonymously on 0800 555 111.