Neighbours fear the next time a garden wall comes crashing down someone will be killed or seriously injured.
The wall in Peal Gardens, which separates the cul-de-sac houses from the busy Argyle Road in West Ealing, has mysteriously 'crumbled' four times in the last two years.
And now, residents are urging the council to install a crash barrier, speed bumps or a reinforced wall to protect pedestrians and tenants from a potential disaster.
Pat Storey, who has lived in Peal Gardens for two years, said the wall was a hazard and had already damaged a neighbour's car.
The 70-year-old said: "It's a huge wall - at least 5ft high - and I'm concerned that one day there may be someone on the pavement or in their car and they could be crushed.
"The first time we think a car or lorry crashed into it and the last time it was there at night and gone in the morning; we didn't even hear it coming down.
"My neighbour Alab Farah is worst off as the wall always falls in her garden, but this time she is refusing to move out despite being concerned about her safety.
"People who live here and have allotted parking spaces are too scared to leave their cars, and something permanent needs to be done to stop this happening again.
"Rebuilding it doesn't seem to be the answer."
An spokesman for Ealing Homes, which is responsible for the maintenance of the wall, said: "We are aware of the damage and will be instructing our contractors to carry out the repairs as soon as possible.
"We will be looking at a longer-term solution to prevent this problem re-occurring."