with regards to the idea that people on Devonshire rd should have the final say as it is them who may be inconvenienced by traffic restrictions I have a few points to float.......
Many people on Devonshire Rd will not be car drivers.
Many car drivers/owners on devonshire rd will commute by foot/bus or train on a daily basis and will not use their car everyday.
Many car drivers/owners on devonshire may be happy to trade restrictions for a quieter rd and safer parking.
People living on Ewelme rd, Benson Rd, Tyson rd, Dunoon Rd and closes leading off them etc, will also be affected and may be inconvenienced by restrictions or may benefit from less traffic/pollution etc.
Many non drivers may appreciate being able to walk to their nearest train station at peak commuting times down a road with little through traffic unlike the present situation where they have a choice of Honor Oak rd or Devonshire rd both of which are busy.
The figures of average speed do not strike me as something to be pleased about. I am not sure why they are presented in the form of what 85% of drivers do. Perhaps we should be worried that so many are driving at 24mph in a zone where the legal speed limit is 20mph, exceeding it by 20%. I wonder if this is different to exceeding a 30mph by 20%. Perhaps we should be told how many drivers exceed the speed limit.
I notice there was a traffic census some time ago on Devonshire rd. Have the results been made public to tell us how many journeys along Devonshire rd are made by residents?