Worried Queen's Park residents say speeding cars have turned their road into a potential 'death trap'.
Campaigners want the section of Kilburn Lane between Chamberlayne Road and Banister Road to be made one-way, in a bid to cut down on the number of cars using the road.
Nursery nurse Julie Power, 30, who lives in Kilburn Lane, was with her nine-year-old son Dylan when he was nearly hit by a car just outside their house.
She said: "A driver came speeding round the corner just as my son was about to step into the road. I had to pull him back. It's like a death trap. It's a miracle nobody has been killed.
"The road is so narrow that drivers have to mount the pavement to pass each other, putting pedestrians at risk every time they walk down the road."
Ms Power has handed a 170-signature petition to Westminster Council and Brent Council, which share ownership of the road, calling for improved safety measures.
Westminster Council's project director for transportation Martin Whittlesm said: "A practical first step could be to narrow the entrance to Kilburn Lane which would reduce the speed of traffic, and help deter drivers using it as a cut through to avoid the traffic lights at the junction of Banister and Chamberlayne Roads.
"I don't believe making the road one way is the answer as a Transport for London funded study has found it would merely move congestion to surrounding streets and slow down bus journeys considerably, which would impact on people even more.
"But along with Brent Council, who share responsibility for the road, we'll see how the narrowing works and keep in contact with residents, reviewing the situation again in six months."