Commuters and community residents near Bethpage State Park are being asked to use different routes.
Officials say the ramps connecting the two roadways will be closed Saturday morning so crews can work safely.
The two-car crash closed the road for hours Wednesday afternoon as police investigated. Police say all four of the teens were from Queens.
BREAKING: Track capacity in Penn Station has been reduced and LIRR trains are being canceled, combined or diverted this morning.
Crews will be working on the northbound lanes from 7 a.m. to noon.
The road will be closed for an hour as crews do safety inspections. Drivers should plan an alternate route.
The work will increase the safety and lifetime of the bridge, which spans Route 109.
BREAKING: Service is suspended on four LIRR branches and there are delays on all the others Friday evening.