was incorporated into the Lincoln Highway, an auto trail that ran from San Francisco east to New York City.

begins at an interchange with US 30 at the western terminus of the freeway section a short distance east of US 30's intersection with PA 10 in Sadsbury Township.

The road passes through the community of Sadsburyville, where there are alternating stretches of center turn lane and divided highway, and continues through a mix of fields and residential and commercial development, crossing into Valley Township.

passes to the north of Chester County G. O. Carlson Airport and heads east past residences and some businesses in the community of Hayti, turning to the southeast and narrowing to a two-lane undivided road.

The route comes to a bridge over Amtrak's Keystone Corridor railroad line and enters the city of Coatesville, curving to the east-northeast and passing through urban residential areas.

continues east through the commercial downtown of Coatesville before heading past a mix of urban homes and businesses.

[2][3] The road leaves Coatesville for Caln Township and comes to another bridge over Amtrak's Keystone Corridor.

From here, the route gains a center left-turn lane and runs past businesses a short distance to the north of the Amtrak line, passing through the community of Caln.

The road continues east past a mix of homes and businesses to the north of the parallel Amtrak line, passing through the community of Gallagherville.

enters the borough of Downingtown, where the name becomes West Lancaster Avenue, and curves to the northeast, heading between residential areas to the north and the railroad tracks to the south and narrowing to two lanes.

The route heads past a mix of homes and businesses before it comes to an intersection with US 322, where US 322 turns northeast for a concurrency with US 30 Bus.

continues through the downtown area and turns northeast, coming to an intersection with the eastern terminus of PA 282.

becomes the border between East Caln Township to the north and Downingtown to the south, gaining a center left-turn lane.

The route becomes undivided as it crosses into West Whiteland Township and continues east through a mix of residential and commercial areas on Lincoln Highway, turning into a five-lane road with a center left-turn lane and running through the community of Whitford.

Past this intersection, the route heads to the south of the Exton Square Mall and narrows to a three-lane road with a center left-turn lane, crossing the Chester Valley Trail.

reaches its eastern terminus at an interchange with US 30 at the eastern terminus of the freeway section and the US 202 freeway in the community of Glenloch on the border of West Whiteland Township and East Whiteland Township, where the road continues east as part of US 30 into the community of Frazer.

The turnpike also opened up settlement to the Northwest Territory past the Ohio River and provided cheap transportation between the coastal areas and the "bread basket" region around Lancaster.

[6] By 1843, the rise of the railroads and the canals reduced the use of the Philadelphia and Lancaster Turnpike, and the road fell into disrepair and saw decreased usage through the later part of the 19th century.

became part of the Lincoln Highway, an auto trail that ran from San Francisco east to New York City.