The incident happened last week
The 33-year-old victim was travelling in a white Ford Fiesta when she was reportedly attacked by the driver just after midnight on Thursday, 17 October.
The suspect abandoned the woman in a lay-by near the Halfway House junction.
She flagged down a passing blue BMW for help and asked the driver to take her to an address in Harold Wood.
In a statement, Essex Police said: “We are keen to speak to this driver, as they may have information that could help with our enquiries.
“If this was you, or someone you know, please contact the Basildon domestic abuse investigation team on 01268 244095, quoting incident 1460 of Wednesday 16 October.”
Tags: West Horndon, Harold Wood, A127