U.S. Route 13 in Delaware partially coincident with U.S. Route 40 in Delaware
The alignment of US 13 in Wilmington has been shifted multiple times to improve traffic flow. By 1932, US 13 was split into the one-way pair of French Street northbound and Market Street southbound in the downtown area. Both directions of the route was shifted to use French Street by 1936. In 1952, a new bridge over the Christina River, the Walnut Street Bridge, was proposed to link Walnut Street in the downtown area with the Dupont Parkway section of US 13 south of the city. Under this plan, the Walnut Street Bridge would be used for northbound traffic while the South Market Street Bridge would be used for southbound traffic. By this time, US 13 was routed on a one-way pair in the downtown area, using Walnut Street northbound and French Street southbound. A year later, the Walnut Street Bridge project was under contract. Construction on the project began in 1955. Construction of the Walnut Street Extension, which included the drawbridge, approach roads, and a new bridge under the Pennsylvania Railroad (now Amtrak's Northeast Corridor), was completed in 1957. As a result, US 13 was split into the one-way pair of South Walnut Street northbound and South Market Street southbound between the south end of the city and downtown.Construction on an interchange with the Delaware Memorial Bridge approach at Farnhurst began on July 12, 1950. On August 16, 1951, the Delaware Memorial Bridge opened to traffic. US 40 was rerouted to use the new Delaware Memorial Bridge to cross the Delaware River, being realigned to follow US 13 north from Hares Corner to Farnhurst. Upgrades to the Farnhurst interchange were finished in July 1961 that provided a connection to the Delaware Turnpike (I-95) that opened on November 14, 1963. In 1954, there were plans to replace the intersection with DE 41/DE 141 in Basin Corner with a modified cloverleaf interchange in an effort to reduce traffic congestion. Construction on the interchange began in September of that year. The interchange between US 13/US 40/US 202 and DE 41/DE 141 was completed in 1956. Plans were made to widen the Philadelphia Pike to a four-lane road between Bellevue Road and Claymont in 1954. The widening project was completed in 1956.In 1961, the concrete bridge carrying southbound US 13 over the Drawyer Creek north of Odessa was closed due to deterioration from the tidal waters of the creek, with plans for a new bridge made. Two years later, the southbound lanes were moved to the new bridge over the creek, following a straighter alignment.
partially overlapping with partially intersecting with partially sharing with partially matching with partially aligning with