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- 1696 - First public road built in Philadelphia County
- 1751 - The Pennsylvania Road opened, Philadelphia to Carlisle
- 1758 - Forbes Road cut through wilderness, Bedford to Pittsburgh
- 1792 - Era of "Turnpike" Roads began, privately built
- 1903 - Pennsylvania State Highway Department created
- 1911 - Sproul Act established State Highway System, 8,835 miles
- 1925 - State Highway Department issues its first highway map
- 1932 - Penrose Rural Roads Act adds 20,156 miles to system
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