It happened before 6 a.m. near the Hutchinson Parkway exit.
There was no immediate word what led to the incident.
All southbound lanes were shut down as an investigation got underway.
By 6:15 a.m. all lanes except the right lane had reopened.
The incident caused delays back to Boston Post Road.
Motorists in cars were advised to use the Merritt Parkway/Hutchinson River Parkway as an alternate route.
Trucks were advised to use I-287 West to the Major Deegan Expressway.
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