Pittsburgh: Main Thoroughfares and The Down Town District
Frederick Law Olmsted report to The Pittsburgh Civic Commission, 1910
of such maps that all municipal engineering, and indeed much other work directly managed by the City, can be planned and carried out with proper economy and efficiency. It is only on the basis of such maps that improvements in the city -- details of city replanning -- can be most economically determined. And in the outlying districts, where the future city is being built, such maps are absolutely essential to an intelligent planning or control which will avoid the heavy penalties that follow haphazard city growth, especially in such a hilly region.
Comparative diagram showing the volume and the estimated gross tonnage of traffic on the thoroughfares leading into the Down Town District