PA 413 begins at the
Burlington–Bristol Bridge, a
vertical-lift bridge over the
Delaware River, in
Bristol Township,
Bucks County, where the road continues south into the city of
Burlington, New Jersey, as
Route 413. From the bridge, PA 413 heads north as two-lane undivided Veterans Highway, passing over the abandoned
Maple Beach community before curving northwest and back north through woodland. The route heads into industrial areas and widens into a four-lane road, bending northeast and crossing
Conrail Shared Assets Operations' Bristol Industrial Track at-grade. PA 413 turns northwest at an intersection with Otter Street and passes under
Amtrak's
Northeast Corridor railroad line before it reaches a junction with
US 13. Past this intersection, the road becomes a four-lane
divided highway and passes between homes to the west and a shopping center to the east, at which point it forms the border between Bristol Township to the west and the borough of
Bristol to the east. The route fully enters Bristol Township again and continues through residential areas with a few businesses as a five-lane road with a
center left-turn lane, passing to the west of the Lower Bucks Campus of
Bucks County Community College. PA 413 becomes a six-lane divided highway as it comes to a ramp that provides access to
I-95 to the west. At this point, PA 413 turns southwest to form a
concurrency with US 1 Bus. on four-lane divided
Lincoln Highway, immediately reaching a
diamond interchange with
I-295. Past this interchange, the roadway crosses Mill Creek again and continues as a four-lane undivided road, passing through commercial areas and crossing into the borough of
Penndel. In Penndel, PA 413 splits from US 1 Bus. by turning northwest onto two-lane undivided Durham Road. A block later, the route intersects the northern terminus of
PA 513 and heads north on Bellevue Avenue. The road crosses
CSX's
Trenton Subdivision railroad line and
SEPTA's
West Trenton Line at-grade east of the
Langhorne station serving the SEPTA line and enters the borough of
Langhorne Manor. Here, PA 413 runs north-northwest through wooded residential areas. The route turns east onto four-lane undivided South Pine Street, with South Bellevue Avenue continuing north to provide access to and from the northbound lanes of the
US 1 freeway to PA 413. PA 413 curves north, crossing back into Middletown Township, and comes to a bridge over US 1 before it intersects East Gillam Avenue, which along with connecting South Bellevue Avenue provides access to and from the southbound lanes of US 1 to PA 413. Following this intersection, the road enters the borough of
Langhorne, narrowing back into a two-lane undivided road and heading into residential areas. The route crosses
PA 213 in the center of Langhorne and becomes North Pine Street, passing near some businesses before heading past more homes. PA 413 crosses back into Middletown Township, where the name changes to Newtown Langhorne Road, and passes under
Norfolk Southern's
Morrisville Line and an abandoned railroad line before heading into wooded areas along the eastern bank of the
Neshaminy Creek and curving northwest. The road curves back to the north away from the creek and passes by residential subdivisions a short distance to the west of
Core Creek Park. The route heads to the west of
St. Mary Medical Center before running past more homes. PA 413 passes between the
George School to the west and farm fields and neighborhoods to the east before it comes to the
PA 332 intersection. Here, PA 413 turns west to join PA 332 on the four-lane divided Newtown Bypass, with State Street continuing north into the borough of
Newtown. The bypass heads through wooded areas in
Newtown Township and comes to a bridge over the abandoned
Fox Chase/Newtown railroad line and Freedom Drive before passing over
Newtown Creek. The road curves northwest and intersects
PA 532, at which point PA 532 joins PA 332/PA 413 on the Newtown Bypass. The highway turns north and passes through wooded areas with nearby residential development. PA 332 splits from the Newtown Bypass by heading west on Richboro Road while PA 413/PA 532 continue to the north on the bypass. The roadway passes over an access road to
Council Rock High School North before it heads to the east of
Tyler State Park, curving to the northwest. At the entrance to the park, PA 413/PA 532 turn northeast to remain on the Newtown Bypass while Swamp Road heads to the northwest. The road passes between a residential development to the northwest and a shopping center to the southeast before the Newtown Bypass ends at an intersection with Durham Road, at which point PA 413 heads north on Durham Road and PA 532 heads east on Durham Road. From this point, PA 413 continues northwest as a two-lane undivided road, passing residential subdivisions before continuing into a mix of farmland and woodland with some homes. The road heads to the southwest of the residential development of
Newtown Grant before it crosses into
Wrightstown Township, where it passes through the community of
Wrightstown. The route runs through more rural areas with some development, crossing
PA 232 in the community of
Penns Park. Past this intersection, PA 413 continues through more farm fields, woods, and housing areas, crossing into
Buckingham Township at the Township Line Road/Pineville Road intersection in the community of
Pineville. The road continues northwest through agricultural and wooded areas, passing to the north of the residential community of Buckingham Springs. The route passes through forested areas with some development and runs a short distance to the east of the
New Hope Railroad, curving north and crossing the railroad line at-grade. PA 413 heads to the northwest again through farmland and crosses
Lahaska Creek before it comes to an intersection with
PA 263 (
York Road) in the community of
Buckingham. The route becomes a divided highway at this point and crosses
US 202 a short distance later. Past US 202, PA 413 becomes a two-lane undivided road again, continuing northwest through wooded areas with some fields and homes. The road passes through the community of
Mechanicsville and runs through more rural areas with some suburban residential subdivisions. The route heads into
Plumstead Township after the intersection with Landisville Road and Ridgeview Drive and continues to the community of
Gardenville, where it crosses Point Pleasant Pike. From here, PA 413 continues north into more rural surroundings, passing through farmland with some patches of woods, crossing the
North Branch Neshaminy Creek and
Geddes Run before passing through the community of
Hinkletown. The road curves to the northwest and becomes the border between
Bedminster Township to the west and Plumstead Township to the east before fully entering Bedminster Township. The route passes through more rural areas, crossing
Cabin Run, before it comes to the community of
Pipersville. Here, PA 413 turns southwest onto Old Easton Road, at which point it follows State Route 1013 (SR 1013), an unsigned
quadrant route. A short distance later, the route turns west onto Deep Run Road and reaches its northern terminus at an intersection with
PA 611. Deep Run Road continues southwest from here as part of SR 1013. ==History==