Part of Route 4 in Farmington is down to one lane in both directions while crews make emergency repairs to fiber optics in the area Monday afternoon.
Farmington police said the road is closed between Interstate 84 and Mt. Spring Road.
Frontier Communications said they had a damaged transport cable in the area that needed repair.
"We have a crew on site and will be working through the evening to repair the damaged cable and get the traffic flow back to normal as soon as possible.We have contacted local authorities for assistance in directing traffic in the affected area. We apologize for the inconvenience as we make the necessary repairs," said Frontier spokesman Andy Malinoski in an email.
It was unclear exactly how long the work will take to complete. Drivers should expect delays in the area.