The Metropolitan Police was alerted to the incident on Barnet Lane at 10am on August 25.
At the scene, officers discovered that a car and motorbike had been involved in the crash.
The male rider of the motorbike was found injured and was taken to hospital where he remains.
He suffered life-threatening injuries
There have been no arrests at this stage and enquiries are ongoing.
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A Met Police spokesperson said: “Police were called to a report of a collision between a car and a motorbike on Barnet Lane, Barnet at around 10:00hrs on Monday, 25 August.
“The rider, a man, has been taken to hospital with life-threatening injuries, where he remains.”
Witnesses or anyone with any information is asked to call 101 or post on X ‘@MetCC’ quoting CAD 2369/25Aug.