Cedar Crest Boulevard begins at an intersection with PA 29 in the borough of Emmaus in Lehigh County, heading northwest as a two-lane undivided road that is part of PA 29. The road passes through residential areas to the southwest of Emmaus High School, heading through a section of Upper Milford Township before becoming the border between Lower Macungie Township to the west and Emmaus to the east and curving to the north. Cedar Crest Boulevard fully enters Lower Macungie Township and crosses Little Lehigh Creek, passing through a mix of fields, woods, and homes and running to the west of Lehigh Country Club. PA 29 crosses into Salisbury Township and widens into a four-lane road that passes between Lehigh Valley Hospital-Cedar Crest to the west and an office park to the east. Cedar Crest Boulevard becomes a divided highway and comes to an interchange with I-78/PA 309, where PA 29 ends and the road becomes SR 1019. Past this interchange, SR 1019 becomes a two-lane undivided road and runs through suburban residential neighborhoods, crossing into South Whitehall Township. Cedar Crest Boulevard comes to an intersection with a one-way pair carrying PA 222 in a business area in the community of Dorneyville, a short distance to the east of Dorney Park & Wildwater Kingdom. The Da Vinci Science Center is located at the northeast corner of PA 222 southbound and Cedar Crest Boulevard. Following this, the roadway becomes the border between South Whitehall Township to the west and the city of Allentown to the east, passing to the west of Cedar Crest College. Cedar Crest Boulevard continues near homes and businesses in the western part of Allentown as a three-lane road with a center left-turn lane, crossing Lehigh Parkway and forming the eastern border of Trexler Park. SR 1019 crosses SR 1002 in a commercial area and continues through residential areas as a two-lane road, leaving Allentown for South Whitehall Township. The road comes to an interchange with the US 22 freeway and heads into business areas. After crossing SR 1006 in the community of Wennersville, Cedar Crest Boulevard heads through a mix of farmland and woodland with some development. The road crosses over Jordan Creek and under Norfolk Southern's C&F Secondary before it passes to the east of Parkland High School. SR 1019 continues through rural areas and crosses into North Whitehall Township in the community of Meyersville. Cedar Crest Boulevard comes to its northern terminus at an intersection with SR 1017.
History
In 1928, the section of the road from Walbert Avenue in Wennersville to Chestnut Street in Emmaus was designated as Pennsylvania Route 229. PA 229 was paved by 1930. By 1950, however, the route number was removed, and it was renamed Cedar Crest Boulevard. PA 29 was designated onto the portion of Cedar Crest Boulevard south of US 309 in the 1950s. The route is sometimes referred to by locals as simply Cedar Crest.
