Both the northbound and southbound lanes through the underpass will be closed – but only one lane closed at a time – while the work is being conducted, Phuket Highways Office Director Somwang Lohanut confirmed in a notice issued earlier this week.
The tunnel will be opened as soon as the work has been completed, Mr Somwang said.
“The work should be finished by about 3pm. I apologise for any inconvenience during this time,” he added.