A scooter rider died after falling from his bike on Finchley Road on Friday.
The 31-year-old from Whetstone suffered serious internal injuries in the incident.
The man fell from his 125cc Vespa at the juction of Arkwright Road at 6.54pm on Friday.
He was taken to the Royal London Hospital, Whitechapel, and died just after 11pm from his injuries.
Police would like to hear from anyone who may have seen a small black hatchback near to the scene of the accident.
It was seen to turn left and drive along Lymington Road immediately after the collision.
Councillor Linda Chung saw the man being treated at the scene. She said: “It was horrible. I saw the poor man lying on a stretcher and all the paramedics were desperately trying to rececussitate him.
Cllr Chung called for calming measures to be brought on to the street that operates more like a “dual-carriageway” than an inner-city road.
She said: “We need better calming measures along that road. It is almost an urban highway with so many people commuting along it. I think we need measures to humanise it to stop it from acting as a dual-carriageway.
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