Substandard road markings on what is claimed to be England's first "cycle street" had to be redone as fines could not be enforced, it has emerged.
The £2.4m project on Adams Road in the west of Cambridge gives cyclists and pedestrians priority over motorists and opened in May.
On Monday the road was closed and the double yellow lines appeared to have been removed as part of the work.
The Greater Cambridge Partnership (GCP), which was behind the project, has now admitted markings were "not to specified design, therefore not enforceable".
Contractor M Group said it was redoing the work at no expense to the taxpayer
The GCP has previously said M Group took "full responsibility and is removing and replacing them at their own expense".
The street is part of a wider so-called "greenway" scheme by the GCP, which aims to improve walking and cycling journeys between the city and the village of Comberton.
Under the rules, motorists can access the road but must give way to cyclists.
The road has been painted red and footpaths have been widened, while much of the on-road parking has been removed to eliminate blind spots for drivers exiting driveways as well as reduce the risk of doors opening onto riders.
M Group has previously apologised "for any disruption caused to local residents and businesses" for the road closure, adding it was "working to keep [disruption] to an absolute minimum".
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