The state Department of Transportation said today that Kunia Road has been reopened in both directions between Lyman Road and the entrance to Kunia Tunnel.

The half-mile stretch had been closed to traffic since Dec. 10 because of emergency roadwork to repair erosion caused by a broken water main beneath the road surface.

Contractor Goodfellow Brothers Inc. completed repairs at a cost of $1.3 million.

Work required excavation of the road surface and the eroded soil base, followed by the addition of about 4,000 cubic yards of replacement soil,