Police are continuing to appeal for witnesses to come forward following a collision on the A34 in Handforth.
Just after 1pm on Thursday 1 July a report was received of a collision involving a white and blue Suzuki motorbike and a white Ford Transit van on the A34 between the Polar Ford roundabout and the Tesco Handforth Dean roundabout on the northbound carriageway.
The rider of the motorbike, a 47-year-old man, was taken to hospital with life-threatening injuries.
As part on ongoing enquiries, officers are keen to speak to the driver of a black vehicle who may have witnessed the collision taking place.
Sergeant Simon Degg said: "As part of our investigation we are continuing to appeal to anyone who may have witnessed the collision or may have information that could assist.
"We are particularly keen to hear from the driver of a black vehicle that was travelling near the scene at the time of collision as we believe they could have some information that would help us with our investigation.
"The same goes to anyone who has dashcam footage of the collision or the aftermath and has not yet submitted it to us to please do so."
Anyone with any information is urged to call Cheshire Police on 101 quoting IML 1026734 or report it via https://www.cheshire.police.uk/ro/report
Information can also be reported to Crimestoppers anonymously by calling 0800 555 111 or report it via https://crimestoppers-uk.org/give-information/forms/give-information-anonymously