I have to say I'm with Decker: [i]“Having it (Manor Mount) open doesn't solve anything because it just relocates a traffic problem from a main road, to a residential street ….Traffic should be on Honor Oak/London Rd/South Circular.”
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Yes, lots of people live along Honor Oak Road - just as they live along London Road and the rest of the South Circular - but these are nonetheless main roads, both historically and in the way they are now designed, with traffic lights, pedestrian crossings and bus routes etc along them. To decant traffic from them onto a steep and winding residential road like Manor Mount - there to confront the Sainsbury's lorries coming UP - defies logic and would create chaos.
I do have a lot of sympathy with Devonshire Road residents. If memory serves, the thinking 'way back when' was that new speed humps along its length (and adjoining roads) would deter traffic from using it to cut out the South Circular. It clearly hasn't worked. But opening-up Manor Mount isn't the way to solve that problem either.
I'm afraid I've no sympathy with people who flout the one-way rule at the top of Manor Mount; they are a menace to oncoming traffic, cyclists and pedestrians alike; not least because of the dangerous speeds they tend to reach by the time they get to the bottom of the hill and try to take that right-hander into Davids Road. (See previous post from Londondrz.)