Kerry County Council says delays to traffic on the Tralee bypass were "regrettable but … unavoidable".
Works are being carried out by a contractor on behalf of Transport Infrastructure Ireland (TII) near Ballygarry.
In a statement, Kerry County Council says it raised the poor condition of several roundabouts on the Tralee Bypass with the TII, which is responsible for the country's national roads.
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The council says it welcomes the TII's upgrading work.
It claims works have mostly been carried out overnight to minimise disruption, but that a delay on Tuesday night contributed to traffic delays on Wednesday morning.
The council expects the contractor will be off-site after tonight (Thursday night).
