2D area diagrams encoding average daily traffic as height and color are set up along their respective highways on a background map of the US. Background map seems to be a cut-out wooden panel; area diagrams potentially cardboard, or also wood veneer.
Source: In: Fortune, June 194, pp. 94-95. Original by-line reads "Map by PRA. Photograph by Richard Carver Wood". PRA is presumably the Public Roads Administration (cf. https://en.wikipedia.org/wiki/Federal_Highway_Administration#History). Accessed via https://archive.org/details/fortune23aprluce/page/94 (Last visit: 30 April 2019)
Added by Till Nagel on April 30, 2019. Category: Passive physical visualization Tags: cardboard, cartograpic, map, paper, roads, traffic
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