Daniel Convissor's Web Site (is in the midst of reconstruction):
Less Highways Results in Less Driving
Cutting back roadway capacity reduces the number of people driving. This
point was, once again, proven in New York City during 1973. The Henry Hudson
Parkway between 72 St and 79 St was closed for repairs. During that
reconstruction, though unrelated to it, a portion of the West Side Highway
collapsed, causing that road to be closed below 42 St.
These two highways form a continuous link along Manhattan's west side. Only
the 72 St to 42 St portion of these highways remained open. This segment lost
59,000 trips, 53% of its traffic load. Less than 4,000 of these trips
reappeared on other roads crossing 60 St.
(Table interpretation of this graph.)
This information is from Garbage In - Garbage Out: NYC Dept. of
Transportation's Flawed Analysis of Closing Central Park
Drives to Traffic written by George Haikalis in August 1992 for
Up to the Auto-Free Central Park Page
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Last updated: 4 April 1999