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Delaware Route 1 is the major north-south freeway in Delaware, connecting the Wilmington metro area with the state capital of Dover. The road is one of the newer and more modern freeways on the east coast.
NOTE: It's worth mentioning here that Route 1's exit numbers are kilometer-based and not mileage or sequential-based, a unique feature of the highway...
Highlights: Biddle's Corner Toll Plaza, William V. Roth Bridge, Delaware City Oil Refinery, Tybout's Corner: JCT US 13
For Historic Overview: http://www.phillyroads.com/roads/DE-1/