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During the Depression in the 1930's, federal aid money for highways was split between the Highway Department and the Welfare Department. Thousands of "reliefers" were put to work on highways as a means of putting unemployed men back to work.
Horses were still important to roadbuilding well into the 1930's. This is a grading and drainage project on M-95 in the western Upper Peninsula in 1935.
As more and more cars took to the highways in the 1930's, Michigan became a national leader in developing techniques to improve highway safety. Here, safety engineers tested the effectiveness of a guardrail.
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