The westbound lane of Halawa Valley Street will be closed between Iwaiwa Street and the Ulune Extension overnight Monday and Tuesday for the installation of new signs and sign structures, the state Department of Transportation said.

The lane will be closed both nights from 10 p.m. to 4 a.m. the following morning.

Motorists traveling westbound on Halawa Valley Street will be detoured to Iwaiwa Street, then left onto Hulumanu Street and left onto Kahuapaani Street. Motorists wanting to access the westbound H-1 Freeway may turn left from Kahuapaani Street onto the Ulune Extension, then turn right onto the H-1 Freeway westbound onramp.

Electronic message boards will be posted to warn motorists of the closure and police officers will assist with traffic control. Motorists are being advised to allow for extra travel time.