The works has left only one open on the coastal road just north of Patong.
Work started at 9am, but traffic tailbacks now extend all the way back to Kamala, a Phuket News reader has reported.
There is “zero movement”, the Phuket News reader explained.
The work is scheduled to to be completed by 8pm tonight, Patong Police said.
“Please avoid this way, use other road,” Patong Police advised.