Police are appealing for witnesses to a collision in Heybridge Approach, Maldon.
A blue Jaguar F-Type and a grey Hyundai i30 collided shortly before 1.15pm on Monday November 23.
The 84-year-old driver of the Hyundai was taken to hospital with serious injuries.
The driver and passenger of the Jaguar suffered minor injuries.
Police would like to speak to anyone who was in the area at the time and saw the collision, or the cars shortly before it happened.
Witnesses and anyone with dash cam footage is asked to contact police quoting incident 532 of 23 November.
You can submit a report online at https://www.essex.police.uk or use the ‘Live Chat’ button to speak to an online operator between 7am-11pm. Alternatively, you can call 101.
Information can also be given to independent charity Crimestoppers anonymously on 0800 555 111 or https://crimestoppers-uk.org