MORE than 150 of the city's crumbling speed ramps are set to be replaced -- at a cost to the taxpayer of €210,000.
The ramps, installed 12 years ago, have been deteriorating for some time. Dublin city council officials admit the cause of the damage is a mystery.
Taxpayers are set to foot the bill for the replacement and repair of 156 red speed ramps across the city.
AA Roadwatch has found that many of the ramps have eroded at an alarming rate, leaving motorists prone to large and dangerous potholes.
Although all the ramps were installed less than 12 years ago, Dublin City Council today said that it has not provided motorists with a "satisfactory service".
A spokesperson for Dublin City Council admitted that the cause of the extensive damage was still unknown.
"We do not know with certainty the root cause of the poor performance of the impressed red asphalt in the ramps.
"It may be inadequate specification, inadequate construction, unforeseen wear and tear, extraordinary weather events or a combination of all four."
Council officials will begin to replace the ramps with black alternatives in August.
Each 4.5 metre speed ramp costs the council around €4,000 to install while 10-metre long ramps, which are used mainly on bus routes, cost €8,000 each.
Fianna Fail councillor Paul McAuliffe told the Herald that the ramps in their current state are posing a danger to motorists.
"Many ramps, particularly on the North side were only installed six years ago. In many cases, they resemble the surface of a rally track rather than a public road," he said.
"Many of them are worn away on either side of the ramp by cars seeking to avoid the ramp. It's a real danger to motorists using the road."
Independent councillor Cieran Perry told the Herald: "I would hope that the new ramps have been tested and are durable enough to withstand the type of weather we had last winter.
"The council should not be subsidising this, we're talking about sorting out the national road infrastructure and the full cost should be borne by the Dept of the Environment."
In a report last year, the city council admitted that a number of the red speed ramps had "not lasted well... the general situation is that many of the red asphalt ramps are ravelling, particularly where traffic is heavy".