A report for Swansea Council under discussion today says there is a £54m backlog of road repairs in the city.
It says recognises that without more investment the condition of the road network will severely deteriorate over the next 10 years, significantly increasing the costs of maintenance.
The overall value of the carriageway network is calculated to be just in excess of £1,039m with an annual depreciation of £122m. Current funding is around half of that needed to keep the carriageway network in its current condition.
The report says additional expenditure of £2m per annum of funding would would mean the condition of the roads network would not deteriorate as a whole.