Having it open doesn't solve anything because it just relocates a traffic problem from a main road, to a residential street that also has an ambulance depot on it. Basically traffic backs up all the way along Manor mount and Davids Road. Mayhem for the residents and blocks off the ambulance.
Traffic should be on Honor Oak/London Rd/South Circular.
But I bet some short sighted motorists think it will save them time or fix a problem, which it doesn't.