The exit from Devonshire Road onto the Sth Circ can be seen clearly by traffic in both directions, whereas traffic coming round from London Road is virtually on top of the exit of Davids Road when it comes into view - not to mention the fact that pulling out from Davids Road is like a game of chicken!
Both junctions are very dangerous. Yes, the Devonshire road exit can be seen clearly but only for a short stretch and only if the road is clear ahead of the approaching vehicle, which is not often the case on the South Circular which not only has a high volume of traffic but especially has a high proportion of trucks and high-sided vehicles.
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if the traffic's backed-up at the lights and a vehicle wanting to turn right from Davids Road pulls halfway across, that could potentially cause a log-jam by blocking the traffic
Yes, this does happen, but also from traffic turning right from Devonshire. Maybe fewer would be trying this manoeuvre if the lights from Honor Oak Road into the South Circular remained green for a couple of seconds longer.