Motorists heading into Kai­lua town from Hono­lulu should brace for at least a week of delays and lane closures at the Windward community’s mauka entrance as crews work to repair a broken sewer pipe, officials said.

The broken pipe is believed to have touched off the formation of a sinkhole measuring about 20 feet long and 12 feet deep that collapsed part of the roadway at Hama­kua Drive and Kai­lua Road early Friday morning.

Crews with private contractor Frank Coluccio Construction Co. will work around the clock on a project that’s estimated to take a week to fix the pipe, according to a city statement issued Monday. However, the work will require the closure of at least two lanes on Kai­lua Road, according to city officials.

Commuters during this past weekend reported significant traffic backups stemming from the sinkhole site. Hono­lulu Police Department officers are expected to be on site the entire time — and they’ll direct traffic there any time they encounter further backups this week — something that likely would take place during peak traffic hours, said Markus Owens, spokes­man for Hono­lulu’s Department of Environmental Services.

Meanwhile, a pump bypass will keep the area’s sewage flowing properly while the pipe is being repaired, city officials said.

In January, contractors working on a road project in Mili­lani discovered an 8-by-8-foot sinkhole on Mako­hi­lani Street between Kee- hu­hiwa and Hoku­lii­lii streets.