The victim died on the M25 clockwise near junction 26 (credit: Google Maps)
Emergency services were called to the clockwise carriageway near junction 26 yesterday (Wednesday, 30 October) at around 1.30pm.
A 30-year-old man, who was riding the motorbike, died at the scene.
The road was closed for several hours while emergency services worked to investigate and make the area safe.
Police are now appealing to hear from anyone who has information or dashcam footage.
If you have any information about this collision, get in touch with Essex Police, quoting incident number 581 of Wednesday 30 October.
You can let police know by submitting a report on the Essex Police website or by using their online Live Chat service.
Alternatively, you can call on 101.
If you would like to make an anonymous report you can contact independent charity Crimestoppers, by visiting their website or by calling 0800 555 111.