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The fire chief said the pressure-treated deck seemed to be built to standards.
An overnight accident left morning rush-hour traffic backed up for miles on the westbound Long Island Expressway.
Newsday says police described it as a fatal accident, but had no further details.
Police said the expressway around Exit 41 in Jericho was expected to remain closed throughout the morning rush hour.
The accident occurred around 3 a.m. Wednesday.