Traffic along Highway 99 in Madera County will be diverted to or from the Avenue 9 interchange as part of the Avenue 12 interchange improvement project, Caltrans said.
The northbound detour is scheduled from 11 p.m. Thursday to 5 a.m. Friday, and the southbound detour began Sunday and runs through Wednesday at 5 a.m.
Motorists are encouraged take alternate routes or add additional time to their commute.
Caltrans encourages drivers to be alert for equipment in the work zone.
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