A section of the Mountain Road at Brandywell Corner is under investigation after surface water began leaking across the carriageway, prompting urgent repairs.
The affected area was resurfaced on May 2 after a private contractor accidentally spilled bituminous adhesive. At the time, no issues were detected.
However, earlier this week, water started seeping from the corner of the new surface, spreading across the road.
The Department of Infrastructure temporarily closed the road on Wednesday evening for minor repairs, but the leak persists.
A team is now on-site planing a small section to assess the cause and extent of the problem before undertaking a full repair.
TT race organiser ACU Events Ltd has been consulted, with its safety officer confirming the issue must be resolved to ensure race safety.
The current closure for TT one-way system preparations is likely to be extended.
The Department stated: “A further update will be issued once more information is available. In the meantime, Mountain Road one-way system preparations continue as planned.”



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