Sadiq Khan is on course to face the electorate in 2020 having failed to deliver a single major scheme according to Greens on the London Assembly.
The claim was made after Westminster council blocked City Hall’s plans to pedestrianise Oxford Street, saying there was insufficient public support for the proposals.
Green Party Assembly Member Caroline Russell blamed the council’s decision on “the Mayor’s lack of leadership”.
Urging Mr Khan “to work with Westminster Council to come up with another plan for Oxford Street fast,” she said he also needed to “show more leadership and vision in building consensus for the major changes needed to make our streets more people-friendly.”
She added: “He hasn’t even trialled a car-free day in London two years into his term, despite his election promises. We know that the majority of Londoners support a proper car-free day for people walking and cycling, rather than for a major event or parade.
“A proper car-free day lets people experience what our streets can be like when they are not clogged by traffic yet the Mayor has shown no will to organise even one.
“There is a real risk he won’t even have one major scheme accomplished after four years, let alone made cycling and walking safe and enjoyable in local neighbourhoods across the capital.”
In a separate intervention, the chair of the Assembly’s Transport Committee called on the Mayor to “think again” and come up with a way to deliver his “flagship” scheme.
Caroline Pidgeon AM added: “The Mayor needs to negotiate a solution for all.
“Any changes to Oxford Street will affect a vast number of Londoners and visitors, so we must get it right.
“Traffic and air quality, provision of a safe cycle route, management of the public space and accessibility all need careful consideration.
“TfL has its work cut out addressing these issues, which clearly concern a considerable number of people.
“The Mayor and Westminster Council need to work together to agree a scheme that works for everyone using Oxford Street and the surrounding area.”