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GRAPHIC PRESENTATION

National Re«ourc«i Board, "State Planning," 1935. Average Daily Traffic on Michigan Trunk Line Highways Based on the Years 1930 and 1931.

1. The legend for this traffic map might have been better if a scale for the widths of

line had been given.

2. The inclusion of the names of the cities is an advantage.

FLOW MAPS

Jamct R. Bibbint and Bion J. Arnold, "Our National Transportation System," Proceedings of New York Railroad Club, April 1923.

Flow Diagram Showing the Rush Hour Passenger Traffic Outbound fromi One-Mile Zone on the Surface Lines in Chicago.

Because this was reproduced from a photostat, much of the detail is lost. The important feature, the use of circles to show the mile zones, is effectively shown even in this reduced scale.

GRAPHIC PRESENTATION

J. R. Bibbint, and Bion J. Arnold, "Our National Transportation System," Proceedings of New Yoric Railroad Club. April 1923. SCALE .6

B. Suburban Passenger Rush Hour

Car Movement to and from

Chicago Terminals from 5 to 6 p.m.

Comparison of the routes taken by two groups of passengers is made in these two traffic maps.

A. Main Line Passenger Rush Hour

Car Movement to and from

Chicago Terminals from 7 to 8 a.m.

Each line represents 10 nrullion dollars' worth of petroleum products

American Petroleum Institute, N. Y. C, "Petroleum Facts and Figures," 1937.