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BAYONNE — A mock traffic accident will cause a real closure of the Bayonne Bridge Sunday morning from 4:30 a.m. to 9 a.m., the Port Authority of New York and New Jersey said.

The bi-state agency will be conducting an emergency preparedness drill in conjunction with New York City's police and fire departments, responding to a fictional scenario involving a head-on collision on the bridge.

Motorists who need to travel between New Jersey and Staten Island during those hours are advised to use the Goethals Bridge or the Outerbridge Crossing.

The Bayonne Bridge roadway has two traffic lanes in each direction, separated by a double yellow line, with no shoulders. A billion-dollar proposal by the Port Authority to raise the roadway to allow taller ships to pass beneath it also includes a widening of all four traffic lanes, plus the addition of a center divider and inner and outer shoulders. The plan is now in now in the federal permitting stage.

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