The current thinking by TfL and councils is that fences do not prevent injury to pedestrians and can add their own dangers as pedestrians and cyclists can get trapped. This may be especially true on a left hand bend on a road that is too narrow and with poor sight lines.
What I see as part of the problem is frustration from drivers turning into Perry Vale from Waldram Crescent, and then accelerating away as the road turns the corner. Part of the solution may be to tackle to cause of frustration (bad parking on Perry Vale) and the other part of the solution would be proper speed bumps at this location, rather than the fairly useless speed tables.
Previously people have suggested a mini-roundabout at Dacres Road junction, and I think this could help improve the junction with Westbourne Drive.
Although it is dangerous to speculate on the causes of specific accidents, it does seem that the improved road design does not work well for people who do not know the road and insist on driving too quickly. This means that speed reduction methods are vital to prevent accidents involving cars, pedestrians, bus stops, and walls.