EMERGENCY services responded to a collision involving two cars at the junction of the A259 and A27 in Pevensey at around 12.30pm on Thursday (7 December).
An elderly woman has been taken to hospital with serious injuries.
Two people were treated at the scene for minor injuries.
Any witnesses or anyone who has dash-cam footage is asked to report online or call 101 quoting 515 of 07/12.
