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Installed along State Highway 1 as part of the NZ Transport Agency's (NZTA) one-way cycle lane project, the concrete islands provide a physical barrier between cyclists and motorists.
Since they were installed last year some motorists have caused damage to the islands and their vehicles.
Now the NZTA will add additional signs to the islands to make them more noticeable.
One of those motorists who has come unstuck was Dunedin woman Lesley Elliott.
Mrs Elliott was driving south in Cumberland St earlier this week when she ran over at least three of the concrete island as she tried to turn into a service station forecourt.
She damaged all four tyres and the underside of her car.
''I ran over three maybe four of them, I thought my car was disintegrating beneath me because there was so much noise,'' she said.
When the car was taken to a mechanic to be repaired, she was told it was not the first vehicle they had seen damaged by the islands.
''I will admit I was at fault but I just think there needs to at least be more signs because they can cause a lot of damage.''
Reilly's Towage and Salvage owner Rob Williams said the company had been called to at least three or four jobs where someone had driven over the islands.
''We've had at least one which was tricky to get off.
''Usually the car has driven over them on one side and punctured two tyres which is enough to stop them in their tracks.''
NZTA project manager Simon Underwood said additional signs would be installed on the islands to improve awareness of the cycle lane's layout and the islands themselves.
Some of the islands had already been shifted, removed or swapped and more adjustments would be made soon, Mr Underwood said.
Those that had been damaged would also be replaced, he said.