May 23
| 1919 | Chief Thomas MacDonald sends his first memo to District Engineers outlining his vision of highways: "There is no work more worthwhile. I have yet to know any man who has devoted a considerable period of his life to the building of roads who is not conscious of having accomplished results whose returns to the public in service can scarcely be measured." | |
| 1938 | BPR engineers E. R. Shepard and A. E. Ryan complete subsurface exploration tests in New Hampshire. The tests, begun May 10, were conducted at the request of Commissioner F. E. Everett of the State Highway Department to demonstrate the possibilities of the electrical resistivity and the seismic methods of exploration in connection with highway construction problems. The tests showed that NH soils were not well adapted to the electrical resistivity method of subsurface exploration, but the seismic testing was well adapted to detecting and locating the approximate position of solid ledge, profiling with respect to density and rigidity, and locating rock formations in connection with grading operations.
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| 1974 | Controversial portions of I-95 and I-695 in Boston, MA, are the first to be withdrawn from the Interstate System under Title 23, United States Code, Section 103(e)(4), which was added to Title 23 by the Federal-Aid Highway Act of 1973. |
