The road that provides access to Darby from
Bryn Mawr was formed in 1687. Originally it was known as Darby Road in its entirety, but later on the section near the old
cooperage in Bryn Mawr was renamed Coopertown Road. Today only the portion in Haverford Township is known as Darby Road. Included in the bill was Legislative Route 180, which ran from the Delaware state line into
Philadelphia. It was assigned to the portion of the historic Darby Road from MacDade Boulevard to its terminus at a
Cobbs Creek bridge that had been built two years beforehand. In 1926, when the
U.S. Highway system was formed,
U.S. Route 13 absorbed LR 180 as a section of its routing. Around this time, roadwork was in progress for a portion of the historic Darby Road not covered by U.S. 13. In existence as a
covered bridge since 1687, the bridge over
Ithan Creek near Darby Road's western terminus was remodeled in 1932. By 1940, U.S. Route 13 was routed along its current alignment, to follow MacDade Boulevard north past Main Street instead of joining it at the intersection.
U.S. Route 13 Bypass was also created by that year, splitting from U.S. 13 at the aforementioned intersection and heading northbound along Main Street and Lansdowne Avenue until what is now
U.S. Route 1 (Township Line Road). In 1987, a Location Referencing System (LRS) was established to define roadways that the
Pennsylvania Department of Transportation deemed important. The system added the concept of a
quadrant route, a road given a uniform four digit number between 1000 and 4000 that was unique per county. Quadrant routes would only be signed in little white markers placed at major intersections. With the creation of the LRS; the historic Darby Road was assigned the number of 2005. ==Major intersections==