Pennsylvania Route 100

Chester County PA 100 begins at a partial interchange with the US 202 freeway north of West Chester in West Goshen Township, Chester County, with access to southbound US 202 and from northbound US 202. From this interchange, the route heads northwest as a four-lane freeway past suburban development, crossing the East Branch Chester Creek before heading into West Whiteland Township. PA 100 comes to a southbound exit and northbound entrance with Pottstown Pike, at which point PA 100 becomes part of Pottstown Pike. The road passes under Amtrak's Keystone Corridor railroad line west of the Exton station, which serves Amtrak and SEPTA's Paoli/Thorndale Line trains, and an abandoned railroad line before coming to an interchange with the US 30 freeway, where PA 100 becomes a four-lane arterial road. Past the US 30 interchange, the route heads north-northwest into Exton as a six-lane arterial road and passes commercial development, running to the east of the Main Street at Exton shopping center. PA 100 crosses US 30 Bus. (Lincoln Highway) and passes to the west of Exton Square Mall. From here, the route continues north as a divided roadway with several intersections controlled by jughandles. The road heads north past more commercial development and narrows to four lanes as it heads into more wooded areas with some development, crossing into Uwchlan Township. PA 100 passes a northbound weigh station before it comes to an intersection with Marchwood Road/Ship Road. The route curves to the northwest and continues near suburban residential and commercial development, turning to the west and intersecting PA 113 in Lionville. PA 100 heads northwest between woods to the southwest and fields to the northeast as it reaches a double trumpet interchange providing access to the Pennsylvania Turnpike (I-76) at the Downingtown interchange. The road passes near business parks and enters Upper Uwchlan Township as it crosses under the Pennsylvania Turnpike and reaches Eagle. Upon crossing County Line Road, PA 100 enters Colebrookdale Township in Berks County and heads north through rural areas with some development as an unnamed road, curving northwest to an interchange with Montgomery Avenue near New Berlinville that provides access to Boyertown and PA 562. Following this interchange, the partially controlled access highway section ends as the route narrows to a two-lane undivided road and passes by businesses. The road heads east of a quarry and enters Washington Township upon crossing Swamp Creek, bypassing Bechtelsville to the east. PA 100 turns to the northeast and passes through a mix of woods and fields with some residential and commercial development. The road intersects Limekiln Road/Passmore Road, with Passmore Road leading east to Grandview Speedway. The route heads through Schultzville before it enters Bally. Upon entering Bally, the road becomes Main Street and passes several homes along with a few businesses. PA 100 leaves Bally for Washington Township again and becomes unnamed, running through farmland with some woods and homes. Upon reaching Clayton, the route crosses into Hereford Township and becomes Chestnut Street, continuing through agricultural areas and crossing Perkiomen Creek before coming to an intersection with PA 29 in Hereford. At this point, PA 29 turns north for a concurrency with PA 100, and the two routes head north into woodland with some fields and residences. Lehigh County PA 29/PA 100 crosses into Upper Milford Township in Lehigh County, which is in the Lehigh Valley, curving northeast through wooded areas with some farmland and development in the South Mountain range. The road turns north near Old Zionsville before it passes through Shimerville. PA 100 splits from PA 29 by turning northwest onto North Kings Highway, with PA 100 Truck heading north along PA 29. The route begins a winding path to the northwest as it descends a hill through a mix of farms and trees. The road heads northwest into Macungie, where it becomes Main Street, a three lane road with a center left-turn lane that passes several homes. PA 100 Truck rejoins at the Chestnut Street intersection and PA 100 continues past more residences and businesses in Macungie. The route crosses Norfolk Southern's Reading Line at-grade and Swabia Creek, passing more commercial establishments as it enters Lower Macungie Township and becomes an unnamed road. The road heads west through a mix of farmland and residential and commercial development, curving to the northwest and losing the center turn lane. PA 100 crosses Little Lehigh Creek and Norfolk Southern's C&F Secondary railroad line at-grade before it intersects Spring Creek Road, at which point it becomes a two-lane divided expressway that bypasses Trexlertown to the west. The route continues northwest near farmland and residential subdivisions into Upper Macungie Township and intersects Weilers Road, which heads north to Hamilton Boulevard. A short distance later, PA 100 meets US 222 at a partial interchange, where northbound US 222 merges with northbound PA 100 and southbound US 222 splits from southbound PA 100. All other connections between PA 100 and US 222 are provided by Weilers Road and Hamilton Boulevard. US 222 and PA 100 continue north concurrent as a four-lane divided expressway called the Frederick J. Jaindl Jr. Memorial Highway, passing near homes and intersecting Grim Road/Cetronia Road at-grade. The road curves northeast and runs between warehouses to the northwest and housing developments to the southeast. PA 100 splits from US 222 at a diamond interchange, at which point PA 100 continues north and Trexlertown Road heads south. The route runs north-northwest through a mix of farm fields and an industrial/warehouse area as an unnamed four-lane divided highway. The road passes businesses and crosses Schantz Road and a Norfolk Southern Railroad branch at-grade before reaching a cloverleaf interchange with I-78/US 22. Past this, PA 100 heads into Fogelsville and crosses Main Street/Tilghman Street. The route passes through commercial areas and narrows to a two-lane undivided road, continuing through wooded areas and turning to the northwest. The road enters Lowhill Township and runs through a mix of farmland and woodland with some development, passing through Claussville. PA 100 winds northwest through more rural areas, running through Lyon Valley. The road heads north into more wooded areas and crosses the Jordan Creek in Lowhill Township. The route runs alongside the creek and winds northwest into Heidelberg Township. PA 100 continues north to its northern terminus at a T-intersection with PA 309 in Pleasant Corners. ==History==

When Pennsylvania first legislated routes in 1911, what would become PA 100 was legislated as Legislative Route 282 between the Delaware border and Lenape, Legislative Route 134 between Lenape and West Chester, Legislative Route 147 between West Chester and Pottstown, Legislative Route 284 between Pottstown and Hereford, and Legislative Route 158 between Hereford and Shimerville. At this time, the road was paved between Boyertown and north of Bally. By 1926, the entire length of the road between Chadds Ford and north of Hereford was paved. PA 62 was designated in 1927 to run from the Delaware border south of Chadds Ford north to US 309/PA 312 in Allentown. The route followed the Brandywine Creek through Chadds Ford to Lenape, where it ran concurrent with PA 52 to West Chester. From here, PA 62 headed north along Pottstown Pike to Pottstown, where it passed through West Chester on Hanover Street. The route continued north on Farmington Avenue to Boyertown and ran through Bechtelsville and Barto on its way to Bally. PA 62 ran north along present-day PA 100 to Shimerville, where it continued to Allentown. A northern section of PA 62 was designated between PA 15 in Wilkes-Barre and US 106/PA 7 (now US 6) in Tunkhannock. A year later, PA 62 was realigned at Shimerville to head north through Macungie, Trexlertown, and Fogelsville to its new northern terminus at an intersection with PA 29 (now PA 309) in Pleasant Corners. PA 29 replaced the PA 62 designation between Shimerville and Allentown. By this time, the route was paved from north of Bally to Macungie. By 1930, the route was paved between the Delaware border and Chadds Ford and between Macungie, and Fogelsville. At this time, the road was under construction from Fogelsville to north of Claussville. PA 62 was renumbered to PA 100 on June 1, 1932, in order to avoid conflicting with US 62, which was designated in the northwestern part of the state. The road was paved between Fogelsville and Pleasant Corners during the 1930s. At the Delaware border, PA 100 connected to DE 100, which was designated in 1938. By 1953, PA 100 was realigned to its current straight alignment between south of Bechtelsville and Bally, bypassing Bechtelsville and Barto to the east. The former alignment is now known as Main Street and Old Route 100. In 1954, the current alignment between Hanover Street in North Coventry Township and Farmington Avenue in Upper Pottsgrove Township was built, with interchanges at PA 83 (now PA 724) and US 422 (High Street). At this time, PA 100 still continued through Pottstown on Hanover Street and Farmington Avenue. In the 1950s, a realigned US 309 replaced the PA 100 designation between US 22 in Fogelsville and Pleasant Corners. By 1959, PA 100 was widened into a divided highway between Boot Road and US 30 (now US 30 Bus.) in Exton. The northern terminus of PA 100 was extended back to Pleasant Corners at US 309 in 1962, replacing the former US 309 designation between Fogelsville and Pleasant Corners that was realigned to present-day PA 309 between Allentown and Pleasant Corners. In 1964, the current divided highway alignment of PA 100 was built between Farmington Avenue in Upper Pottsgrove Township and New Berlinville, which included interchanges at Farmington Avenue, PA 73, and Montgomery Avenue. PA 100 was rerouted to the new alignment between Hanover Street in North Coventry Township and New Berlinville; the former alignment is now Hanover Street, Farmington Avenue, PA 562, and Reading Avenue. However, in 1968, a long, four-lane freeway was built connecting PA 100 south of Exton to US 202 north of West Chester. The freeway was officially unsigned, but was colloquially referred to as the "PA 100 Spur" and was designated as State Route 2023 (SR 2023) when the Location Referencing System was established in 1987. In the 1970s, PA 100 was widened into a divided highway between Exton and Lionville. In 1988, plans were made to bypass the section of PA 100 through the village of Eagle, which was narrow and suffered from traffic congestion. After years-long delays due to funding issues, construction on the Eagle Bypass began in 2003. The bypass was completed between Byers Road and PA 100 north of Eagle in fall 2005, and the remainder of the bypass south to PA 100 south of Eagle was completed on August 19, 2009. The bypass was named Graphite Mine Road and is designated as SR 1055 from PA 100 south of Eagle north to Byers Road and is a local township road from Byers Road north to PA 100 north of Eagle. PA 100 continues to follow Pottstown Pike through the center of Eagle. The former alignment through Trexlertown became known as Trexlertown Road, which is designated SR 6100. The former route of PA 100 between the Delaware border and south of Exton was designated SR 3100 in Chester County and SR 3101 in Delaware County, following Chadds Ford Road, Creek Road, Lenape Road, Price Street, High Street, and Pottstown Pike. Delaware continues to designate DE 100 starting at the state line where PA 100 formerly was and continuing south to its terminus at DE 4 south of Elsmere. ==Major intersections==

{{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint {{PAint ==PA 100 Truck==

Pennsylvania Route 100 Truck is a truck bypass of a winding portion of PA 100 between the north end of the PA 29 concurrency and Macungie on which trucks with trailers over 45 feet are not allowed. The route heads north on PA 29 before heading west along Buckeye Road and Chestnut Street concurrent with PA 29 Truck. ==See also==