Mayor Rudolph W. Giuliani, Department of Transportation Commissioner Iris Weinshall and Police Commissioner Bernard B. Kerik announced today that the ban on single occupancy vehicles entering Manhattan south of 63rd Street via any bridge or tunnel will now be in effect from 6 a.m. to 10 a.m., Monday through Friday beginning Wednesday, October 17, 2001. The easing of the time restrictions by one hour reflects the fact that motorists have heeded the City's urging to use mass transit, and to carpool. The scaling back of the hours from 11 a.m. to 10 a.m. also comes as a result of additional thoroughfares being opened in Lower Manhattan.
http://www.nyc.gov/html/om/html/2001b/pr326-01.html