Pennsylvania Route 66

PA Turnpike 66 begins in New Stanton at a cloverleaf interchange with US 119, immediately east of connections to Interstate 70 and Interstate 76/Pennsylvania Turnpike. Up to Arona Road, its first interchange, no tolls are collected. The route then meets PA 136 before reaching the Hempfield Toll Plaza.

Near Jeannette, PA Turnpike 66 interchanges with US 30 and PA 130. North of here, the road meets PA 66 Business before reaching the northern terminus of the same route 3 miles (4.8 km) further north.

At this point, PA Turnpike 66 becomes PA 66 and the freeway ends at a traffic signal just north. PA 66 then meets US 22 at a single-point urban interchange.

PA 66 southbound at the US 22 interchange near Delmont

North of the Amos K. Hutchinson Bypass, PA 66 enters Salem Township as Sheridan Road. In Delmont, PA 66 is called Sheridan Road. In Washington Township, PA 66 passes west of Beaver Run Reservoir.

In the village of Mamont, PA 66 intersects Pennsylvania Route 286. In the village of Poke Run north of PA 286, PA 66 intersects the eastern terminus of Pennsylvania Route 366. Then PA 66 intersects Pennsylvania Route 380, PA 380 west heads for downtown Pittsburgh.

South of Oklahoma, PA 66 intersects the southern terminus of Pennsylvania Route 356. In the village of Paulton, PA 66 intersects the southern terminus of Pennsylvania Route 66 Alternate.

PA 66 Alternate goes into Vandergrift and PA 66 goes into Apollo. In Oklahoma, PA 66 meets the northern terminus of Pennsylvania Route 819. In downtown Oklahoma, PA 66 turns to the east and crosses the Kiskiminetas River.

After crossing the Kiskiminetas River, PA 66 enters Armstrong County and begins a concurrency with Pennsylvania Route 56 in Apollo. As they began their concurrency, PA 56/PA 66 are called Warren Avenue in Apollo. As PA 56/PA 66 enter the boro of North Apollo they parallel the Kiskiminetas River. In the village of North Vandergrift, the concurrency between PA 56 and PA 66 ends when PA 66 intersects PA 66 Alternate and PA 56 and PA 66 ALT begin their own concurrency into Vandergrift.

As PA 66 continues to parallel the Kiskiminetas River, it is called Lincoln Avenue. While paralleling the Kiskiminetas River, PA 66 has snake like curves. In Leechburg, PA 66 becomes Market Street, 3rd Street, and Pershing Avenue. As PA 66 exits Leechburg it does not parallel the Kiskiminetas River.

In Bethel Township, PA 66 meets the northern terminus of PA 66 Alternate. In Ford City, PA 66 becomes Main Street and intersects the northern terminus of Pennsylvania Route 128 at an "Y" intersection.

Southeast of Kittanning, PA 66 begins a concurrency with U.S. Route 422 and Pennsylvania Route 28 at an interchange. At the next exit US 422 leaves the concurrency and PA 28/PA 66 continue north at-grade.

In Rayburn Township, PA 28/PA 66 intersect the western terminus of Pennsylvania Route 85. PA 28/PA 66 continue towards the northeast without intersecting a route for more than 17 miles (27 km).

In South Bethlehem, PA 28/PA 66 become Broad Street and meet the northern terminus of Pennsylvania Route 839. The route then crosses the Redbank Creek into Clarion County after spending 43 miles in Armstrong County.

PA 66 approaching its end at US 6 in Kane

After crossing the Redbank Creek, PA 28/PA 66 enter Clarion County. In New Bethlehem, the concurrency between PA 28 and PA 66 ends when PA 66 leaves PA 28.

North of PA 28, PA 66 becomes Wood Street and intersects the eastern terminus of Pennsylvania Route 861. In Clarion Township, PA 66 begins a concurrency with Interstate 80 at exit 64. Then I-80/PA 66 meet Pennsylvania Route 68 at exit 62.

After crossing the Clarion River, PA 66 leaves I-80 at exit 60 (trumpet interchange). PA 66 continues north at grade. In Paint Township, PA 66 intersects U.S. Route 322 as Paint Boulevard. PA 66 continues towards the north paralleling rail road tracks.

In Farmington Township, PA 66 intersects Pennsylvania Route 36.

As PA 66 enters Forest County, PA 66 intersects the northern terminus of Pennsylvania Route 899. In Jenks Township, PA 66 enters Allegheny National Forest. As PA 66 enters Elk County, PA 66 has a 2 miles (3 km) concurrency with Pennsylvania Route 948. Northeast of PA 948, PA 66 becomes Kane-Russell City Road. PA 66 enters McKean County as Fraley Street. In Kane, PA 66 ends at a "T" intersection with U.S. Route 6.[3][4]

PA 66 Alt. northbound past PA 56 in North Vandergrift

Pennsylvania Route 66 Alternate (PA 66 Alt.) is an 11-mile-long (18 km) alternate route through Westmoreland County and Armstrong County, Pennsylvania.

It leaves its parent route in Washington Township and travels through the center of Oklahoma and Vandergrift, while the mainline route bypasses residential neighborhoods along the riverfront.

PA 66 Alt. merges with PA 56 to cross the Kiskiminetas River. It becomes a separate route again in Parks Township (North Vandergrift), avoiding several riverfront towns as it travels along a hilly, rural stretch, before rejoining mainline PA 66 in Bethel Township.

From 1928 to 1938, the segment from North Vandergrift to the northern terminus was designated as PA 566.

Major intersections

County	Location	mi	km	Destinations	Notes
Westmoreland	Washington Township	0.00	0.00	PA 66 – Apollo, North Washington	Southern terminus of PA 66 Alt.
	Vandergrift	2.98	4.80	PA 56 west (Custer Avenue)	South end of PA 56 overlap
Armstrong	Parks Township	6.46	10.40	PA 56 east / PA 66 (Lincoln Street) – Leechburg, Apollo	North end of PA 56 overlap
	Bethel Township	11.37	18.30	PA 66 – Leechburg, Ford City, Kittanning	Northern terminus of PA 66 Alt.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

PA 66 Bus. northbound past PA 993 in Hempfield Township

Pennsylvania Route 66 Business (PA 66 Bus.) is an 8-mile-long (13 km) business route in Westmoreland County, Pennsylvania, connected two fingers of suburbia located east of Pittsburgh. The highway was signed PA 66 Business after PA 66 was shifted onto a newly created toll road bypass.[9]

The route begins nearly a mile south of the original terminus of PA 66, at a juncture with US 30 (which loops as a freeway around the city). It is cosigned with US 119 and PA 819 to the city center, before traveling on its own accord through several suburbanized miles.[9]

The route then becomes more rural, as it provides a free connection to the east-central edge of suburban Pittsburgh at Delmont. The highway is designated by PennDOT SR 0119 between US 30 and Pittsburgh Avenue in Greensburg (along the concurrency with US 119), then is part of SR 0066 north of there.[9]

Major intersections
The entire route is in Westmoreland County.

Location	mi[9]	km	Destinations	Notes
Southwest Greensburg	0.000– 0.021	0.000– 0.034	US 30 to PA Turnpike 66 – Pittsburgh US 119 south / PA 819 south (South Main Street) – Youngwood	Interchange; southern terminus of PA 66 Bus.; south end of US 119/PA 819 overlap
Greensburg	1.255	2.020	US 119 north / PA 819 north / PA 130 (Pittsburgh Street) to US 30 – Ligonier	North end of US 119/PA 819 northbound overlap; US 119/PA 130/PA 819 on one-way pair
	1.331	2.142	US 119 / PA 130 / PA 819 (Otterman Street)	North end of US 119/PA 819 southbound overlap; south end of PA 130 westbound overlap; US 119/PA 130/PA 819 on one-way pair
	1.851	2.979	PA 130 west (Clopper Street)	North end of PA 130 westbound overlap
Hempfield Township	4.815– 4.914	7.749– 7.908	PA Turnpike 66 – New Stanton, Delmont	Exit 9 (PA 66); E-ZPass or toll-by-plate
	5.960	9.592	PA 993 west (Bushy Run Road) – Harrison City	Eastern terminus of PA 993
Salem Township	7.743	12.461	PA 66 north / PA Turnpike 66 south / Brick Hill Road – Delmont, Greensburg	Exit 12 (PA 66); northern terminus of PA 66 Bus.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Electronic toll collection