From wnbc.com - News - Holland Tunnel Closed To Inbound Truck Traffic:
"The Holland Tunnel closed to commercial traffic heading to New York at 12:01 a.m. Monday, officials said Sunday evening.
The ban was "correlated to the warning about the downtown financial districts," said Tony Ciavolella, a spokesman for the Port Authority of New York and New Jersey.
He said commercial vehicles should use the Lincoln Tunnel and George Washington Bridge as alternative routes. The ban would definitely affect trucks, said Ciavolella, but it was not immediately clear whether commercial vans would be prohibited.
The ban was not slated to affect vehicles leaving New York City. No ending date for the ban was set."