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First, the amount and importance of the traffic likely to be affected in each case. Second, the extent to which any given solution would benefit or injure the bridge traffic and the river traffic, respectively.

1. Amount and Importance of Traffic Affected. -- (a) Bridge Traffic -- There are in question six highway bridges and two railroad bridges.

Before referring to the statistics in regard to traffic over these bridges we wish to point out that much the greater part of it is of a kind daily and intimately affecting the business and the convenience of a large population. Any delay affecting the transportation of passengers over any of these bridges, and any delay or any increase of cost in teaming package freight and supplies from freight stations and warehouses and stores on one side of the river to their destination on the other side, would be felt very sharply by a considerable fraction of the manufacturers, merchants and other citizens of Pittsburgh. The inconvenience arising from any interference with traffic of this class would clearly be greater in proportion to the volume and value of the traffic than in the case of the slower moving river traffic. Ten minutes' delay to

Diagram No. 1, showing comparative importance of traffic over and under Allegheny river bridges

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Last modified on 22-Dec 1999
Design format: copyright 1997-1999 Bruce S. Cridlebaugh
Original document: Frederick Law Olmsted, 1910