During World War II, the government encouraged carpooling because they needed the gas and rubber for the war (source). Here is a sample of the propaganda:

This one is, as it appears, by Dr. Seuss:

The next two are from the State of Ohio:

In the comments, both Eoin and Toban B. (T.B.) pointed us to this poster (found here).

Lisa Wade is a professor of sociology at Occidental College and the co-author of Gender: Ideas, Interactions, Institutions. You can follow her on Twitter and Facebook.
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