The Supreme Court has refused to hear an appeal by campaigners against low traffic neighbourhoods (LTNs) in Lambeth.
The decision was made on 8 December last year, but only announced more recently.
The OneLambeth campaign group has been raising funds for the appeal.
Supreme Court judges Lord Reed, Lady Rose and Lord Richards said: permission to appeal was refused “because the appeal does not raise an arguable point of law of general public importance which the court should determine at this time”.
The Court of Appeal rejected an appeal against a High Court decision to refuse a judicial review of Lambeth council’s creation of LTNs in April last year.
Lambeth has seven LTNs at various stages of implementation: Brixton Hill; Ferndale; Oval to Stockwell; Railton; Streatham Hill; Streatham Wells; and Tulse Hill.