The multi-million-pound revamp of roads in Norwich, including the £6.1m St Stephens Street shake-up, is to be investigated by a government-appointed organisation.
Amid criticism of the work which was done on St Stephens Street, Norfolk County Council has confirmed an external agency will explore whether that - and other schemes around the city - were value for money.
The St Stephens Street work, which saw disruption in one of Norwich's main shopping streets from January until October, was one of a number of schemes the county council was awarded £32m to do through the government's Transforming Cities scheme.
The St Stephens work includes new 'sawtooth' bus parking bays, wider pavements, crossing points and seating, although a delay means bus stop shelters will not be put in until the new year.
Brian Watkins, leader of the Liberal Democrat group at County Hall, had branded the scheme a waste of money, which prompted his party colleague - city councillor Judith Lubbock - to ask what assessment will be made to establish if it was worth it in terms of getting more people to use buses.
Martin Wilby, the council's cabinet member for highways, infrastructure and transport, said: "A comprehensive programme of monitoring and evaluation is being undertaken as part of the delivery of the Transforming Cities Fund, which has funded the delivery of the St Stephens Street works and other bus priority and sustainable transport works in Norwich.
"This is being led by an external agency appointed by central government and the county council is participating fully in this.
"This evaluation programme will consider a wide range of impacts, including bus patronage.
"We will be happy to discuss with the evaluation lead how impacts on businesses and existing passengers can be appropriately assessed."
Mrs Lubbock asked if bus operators would be held to account to improve the reliability of services and potentially the frequency of services, each time taxpayers' cash was spent on changes.
Mr Wilby said an 'enhanced partnership' between the county council and bus operators placed commitments on both sides to improve public transport.
Other schemes where Transforming Cities money has been spent include changes to the Grapes Hill roundabout and the controversial bus lane in Cromer Road, Hellesdon.
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