There was a lot of rain in the morning. I don't know if that's when this occurred.
The road is also difficult for motorists. Travelling south from Waldram Place, all the vehicles want to turn right, but usually have to gamble due to late or absent signals from cars coming round the bend (which usually want to turn left into Waldram Place to access the south circular.
Then they are faced with oncoming traffic due to the parked cars, which push them over. Cars are frequently parked on double yellows at the end, which further reduces visbility. Then there are the speed humps in the middle of the road, which only seem to serve the purpose of positioning cars in the road, bringing them into conflict with vehicles coming the other way.
Proceeding north, as cars proceed around the corner, they are faced with traffic trying to turn right out of Waldram Place, sometimes cutting the corner. Coaches actually take this route too. There is also a lot of setting down or taxis 'just stopping for a bit'.
Bottlenecks, poorly designed speed measures, narrow lanes and reduced visibility (compounded by what I see as a lack of parking enforcement throughout the area) all combine to make it a route filled with distractions and danger.
Not that this is any excuse for poor driving or speeding. It could definitely be improved though.