Location: DE 1 and I-95, New Castle Cty Overhead sign as Delaware 1 begins. Location: DE 1 and I-95, New Castle Cty Reassurance shield as DE 1, the most important state highway in Delaware, begins. Location: DE 1 and Mall Rd, New Castle Cty Exit for Mall Rd. DE 7 actually exits with DE 273 … Continue reading Delaware Route 1, I-95/DE 7/DE 58 to DE 273