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On March 2 in US military history--

1925 – The first nationwide highway numbering system was instituted by the joint board of state and federal highway officials appointed by the secretary of agriculture. In order to minimize confusion caused by the array of multiform state-appointed highway signs, the board created the shield-shaped highway number markers that have become a comforting sight to lost travelers in times since. Later, interstate highway numbering would be improved by colored signs and the odd-even demarcation that distinguishes between north-south and east-west travel respectively. As America got its kicks on Route 66, it did so under the aegis of the trusty shield. For instance, in the east, there is U.S. 1 that runs from New England to Florida and in the west, the corresponding highway, U.S. 101, from Tacoma, WA to San Diego, CA.