 Construction of an interchange at the Dover Air Force Base main gate commenced in February 1996 . This project resulted in the relocation of the main gate further back in order to build the interchange and the overpass linking the main gate to base housing . This construction resulted in facilities having to be constructed at the north gate in order to be able to handle base traffic . In May of that year , groundbreaking took place for the DE 1 toll road between Odessa and St. Georges . The segment of DE 1 between US 13 south of Odessa and US 13 in St. Georges opened in November 1999 . DE 1 was subsequently rerouted off US 13 between those two points . 
