Pennsylvania State Route 3
The route begins in downtown West Chester and heads east out of the borough as a one-way pair of streets. Between West Chester and Upper Darby, PA 3 follows a four-lane divided highway named West Chester Pike through suburban areas. Along this stretch, the route passes through Edgmont, Newtown Square, Broomall, and Havertown. The route has an interchange with Interstate 476 (I-476) between Broomall and Havertown. Upon reaching Upper Darby, PA 3 heads into Philadelphia along Market Street. In Philadelphia, the route follows multiple one-way pairs, running along Chestnut Street eastbound and Walnut Street westbound in West Philadelphia before heading into Center City Philadelphia along Market Street eastbound and John F. Kennedy Boulevard westbound and ending at Philadelphia City Hall.
Philadelphia and West Chester were linked by a dirt road dating back to 1793. The Philadelphia and West Chester Turnpike Company was created to build a toll road between the two places in 1848. The turnpike was built as a plank road between Philadelphia and Newtown Square in the 1850s before becoming a stone road in the 1880s. A horse-drawn rail line was built along part of the turnpike in the 1850s and a trolley service was introduced in the 1890s. The state took over the West Chester Pike in 1918. In 1927, the route was designated as part of PA 5.
PA 3 replaced the PA 5 designation between West Chester and Philadelphia in 1937. Trolley service was replaced by buses in the 1950s to allow for the widening of PA 3 between West Chester and Philadelphia to four lanes. By 1960, PA 3 was shifted to end at US 13 in Southwest Philadelphia. The routing was shifted to US 13 west of University City by 1970 before the route was extended east to Philadelphia City Hall during the 1970s.
Route description
Chester and Delaware counties
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PA 3 begins at an intersection with US 322 Bus. (High Street) in the downtown area of the borough of West Chester in Chester County near the historic Chester County Courthouse. From here, the route heads northeast on the one-way pair of East Market Street eastbound and East Chestnut Street westbound. The one-way streets carry two lanes in each direction as they pass downtown businesses. At the intersection with Matlack Street, the westbound direction of PA 3 shifts from East Chestnut Street to East Gay Street. The route continues to follow East Market Street eastbound and East Gay Street westbound through commercial areas, passing north of the terminus of the West Chester Railroad at the West Chester station along East Market Street. PA 3 leaves West Chester for West Goshen Township and intersects Montgomery Avenue (westbound only) and Garfield Avenue/Westtown Road before it comes to an eastbound exit and westbound entrance with Paoli Pike. At this point, both directions of the route join and head east along four-lane divided West Chester Pike, passing through residential areas in the community of Chatwood. PA 3 comes to a partial cloverleaf interchange with the US 202/US 322 freeway and runs past businesses and some homes. The road curves east-southeast at the Strasburg Road intersection and crosses into East Goshen Township, where it continues past suburban neighborhoods and commercial establishments, crossing the East Branch Chester Creek and passing through the community of Goshen. PA 3 enters Westtown Township and reaches an intersection with PA 352, forming a short concurrency with that route before PA 352 splits to the southeast. The road heads east through wooded areas with residential subdivisions as it continues into Willistown Township. The route intersects the eastern terminus of PA 926 and curves east-northeast through a mix of fields and woodland with some homes, crossing the Ridley Creek before coming to a junction with Delchester Road.
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PA 3 enters Edgmont Township in Delaware County as it passes to the north of Ridley Creek State Park. The road continues east with some homes and businesses, intersecting Providence Road. After passing to the south of a shopping center, the route crosses Crum Creek into Newtown Township and heads south of the Delaware County Veterans Memorial, running past a mix of fields and development. PA 3 curves east at the Boot Road intersection and passes between a business campus that includes SAP's North America headquarters to the north and a residential neighborhood to the south. The road heads into business areas and reaches intersections with Bishop Hollow Road and PA 252 in the community of Newtown Square. Following the PA 252 intersection, the route continues east through a mix of suburban residential and commercial areas. At the Media Line Road junction, PA 3 crosses into Marple Township and soon intersects Springfield Road. The road passes more homes and businesses and comes to a junction with PA 320 in the community of Broomall. The route continues near suburban neighborhoods with some businesses before it reaches a partial cloverleaf interchange with I-476.
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Past the I-476 interchange, PA 3 intersects Lawrence Road and crosses the Darby Creek into Haverford Township, where another section of Lawrence Road splits to the north. The road continues east past homes and businesses as it passes through the community of Havertown, reaching a junction with Eagle Road. PA 3 has an intersection with Manoa Road as it passes to the north of the Llanerch Country Club, continuing through suburban development. Farther east, the route crosses Naylors Run and heads into the community of Llanerch, where it intersects Darby Road a short distance before coming to a junction with US 1. After crossing US 1, PA 3 enters Upper Darby Township and continues past suburban businesses and homes. The road crosses State Road and heads into more urban areas of residential and commercial development. A set of SEPTA trolley tracks begins running in the median before the route comes to Terminal Square, where it crosses SEPTA's Route 101 and 102 trolley lines at-grade and intersects Victory Avenue/Garrett Road. Past this, PA 3 heads east on four-lane undivided Market Street as it passes between SEPTA's 69th Street Transportation Center to the north and urban businesses to the south, gaining a median before the 69th Street intersection. The route becomes undivided again and runs past more commercial development, forming the border between the borough of Millbourne to the north and Upper Darby Township to the south. PA 3 heads past some homes before turning into a divided highway at the eastern edge of Millbourne as SEPTA's Market–Frankford Line rises to pass over the road.