История трассы US 220: изменения и развитие

Highway in the United States
the route planned as US 220 in 1925
In early 1927, US 220 absorbed the Muncy–South Waverly section of US 711, Most of this alignment of US 220 followed previously unnumbered roads, save for two areas in the vicinity of Bald Eagle and Williamsport, Pennsylvania, where it followed short pieces of PA 5 and PA 4, respectively. Both routes were assigned in 1924.

The largely intrastate route was significantly extended over the course of the next decade. It was extended past Cumberland to the Virginia state line by 1930, through Virginia to the North Carolina state line by 1935, and finally to US 1 in Rockingham, North Carolina, by 1941. In Virginia, US 220 replaced the piece of SR 18 north of Covington, all of SR 12 (Clifton Forge to near Roanoke), and all of US 311 in Virginia, originally designated in 1926 to run from US 11 in Roanoke south along SR 33 to North Carolina. US 220 was extended into New York—albeit for only a half mile (0.8 km)—by 1948. At the time, the route followed Keystone Avenue through Sayre to South Waverly, where it turned onto Bradford Street. The highway turned again after three blocks, proceeding north on Pennsylvania Avenue to the state line and into the adjacent village of Waverly, New York. US 220 ended five blocks into New York at an intersection with Chemung Street, then part of NY 17. When the Southern Tier Expressway was built, Chemung Street became a section of NY 17C as NY 17 was moved onto the freeway. NY 17C was truncated to a junction with NY 34 several blocks to the east in the late 2000s, leaving US 220 isolated from the rest of New York's numbered route system. In 2017, the American Association of State Highway and Transportation Officials (AASHTO) approved a request by New York and Pennsylvania to delete US 220 north of I 86/NY 17.

The Athens–Sayre Bypass, a limited access highway bypassing the boroughs of Athens and Sayre, was completed in 1973. US 220 was realigned to follow the new highway, which began southwest of Athens and ended at a junction with Chemung Street less than 0.1 mile (0 km) north of the state line. Most of US 220's former alignment became PA 199; however, the northernmost part of PA 199 was assigned to an alternate alignment to the east on Mohawk and Spring streets, both of which were already state maintained. The Pennsylvania Avenue (former US 220) state line crossing was dismantled as part of the Southern Tier Expressway's construction. US 220 originally continued northeast of Port Matilda, along the at grade Appalachian Thruway to an interchange with I 80 near Milesburg. US 220 was realigned onto US 322 and a limited access highway running from State College to Bellefonte on May 30, 2003, at which point the previous route via Milesburg was redesignated as US 220 Alternate. The latter route was extended to Tyrone when US 220 was moved onto a new section of I 99 from Tyrone to Port Matilda in 2008. In the future, US 220 and I 99 will form a 135 mile (217 km) concurrency throughout much of central Pennsylvania, from the interchange with the Pennsylvania Turnpike at Bedford to the intersection with US 15 at Williamsport. I 99 will leave US 220 here to follow US 15 north to Corning, New York.

The southern terminus of US 220 in Rockingham was originally at the intersection of East Broad and Hancock streets (US 1 and US 74), where a sign said "US 220 Ends Here". From here, US 220 went north on current US 74 Business, Old Ellerbe Road and Billy Covington Road before rejoining its current alignment north of the city. The four lane portion of US 220 between Ellerbe and Rockingham roads was completed in two sections; the northern one, ending at the north end of Billy Covington Road, was finished first in the 1960s. Some of the old alignment is still visible at the north end of Billy Covington Road. Parts of US 220 in Virginia south of Roanoke follow what used to be called the Carolina Road or the Great Road. These roads, stretching from the current day Philadelphia area to what is now Atlanta (southern end of the Appalachian Mountains), were mostly roads built over old Indian trails. Another branch went west from present day Roanoke to Cumberland Gap. Parts of this road in Henry County are now known as the Old Stage Road. It crossed the Smith River just north of the current US 220 crossing. From Henry County the road crossed the Mayo River and headed towards Winston Salem, North Carolina. The Mayo River crossing is still visible. In Martinsville, Virginia, US 220 originally passed through downtown Martinsville on West Church Street and Starling Avenue. It was moved onto the newly built Memorial Boulevard the late 1940s and onto a new bypass around Collinsville and Martinsville in the mid 1970s. The alignment through Collinsville and Martinsviile remains signed as Business US 220. In the vicinity of Cumberland, Maryland, US 220 originally proceeded into the city limits on Greene Street. It crossed Wills Creek via Baltimore Street before connecting to Mechanic Street. From Mechanic Street to the city limits, traffic was split between two parallel one way streets, with northbound traffic carried by Frederick Street and southbound traffic carried by a narrower Bedford Street until the streets merged as Bedford Road, now unsigned MD 807, north of the city. The highway continued on a northeasterly track to connect to Pennsylvania at the Mason–Dixon Line.