South Carolina Highway 642, also known as Dorchester Road, is a major state highway in North Charleston

North Charleston, South Carolina

North Charleston is the 3rd largest city in the U.S. state of South Carolina with incorporated areas in Berkeley, Charleston, and Dorchester counties. On June 12, 1972 the city of North Charleston incorporated and was the 9th largest city in South Carolina. According to the 2010 Census, North...

 and Summerville

Summerville, South Carolina

Summerville is a town in the U.S. state of South Carolina situated mostly in Dorchester County with small portions in Berkeley, and Charleston counties. It is part of the Charleston-North Charleston-Summerville Metropolitan Statistical Area as designated for statistical purposes by the U.S. Office...

. The road runs for 19.1 miles from U.S. 78 in North Charleston, SC

North Charleston, South Carolina

North Charleston is the 3rd largest city in the U.S. state of South Carolina with incorporated areas in Berkeley, Charleston, and Dorchester counties. On June 12, 1972 the city of North Charleston incorporated and was the 9th largest city in South Carolina. According to the 2010 Census, North...

 to U.S. 17 Alt

U.S. Route 17 Alternate (South Carolina)

U.S. Route 17 Alternate is an alternate route of U.S. Route 17 in South Carolina that runs between Pocotaligo and Georgetown. It is long and has been four-laned in various segments since 1970.-Route description:...

 southwest of Summerville, SC

Summerville, South Carolina

Summerville is a town in the U.S. state of South Carolina situated mostly in Dorchester County with small portions in Berkeley, and Charleston counties. It is part of the Charleston-North Charleston-Summerville Metropolitan Statistical Area as designated for statistical purposes by the U.S. Office...

. Dorchester Road is a heavily congested highway during morning and evening traffic periods. In Summerville

Summerville, South Carolina

Summerville is a town in the U.S. state of South Carolina situated mostly in Dorchester County with small portions in Berkeley, and Charleston counties. It is part of the Charleston-North Charleston-Summerville Metropolitan Statistical Area as designated for statistical purposes by the U.S. Office...

, it narrows to a two lane road, creating a bottleneck of traffic in Dorchester County.
Current plans call for widening of the road from Summerville

Summerville, South Carolina

Summerville is a town in the U.S. state of South Carolina situated mostly in Dorchester County with small portions in Berkeley, and Charleston counties. It is part of the Charleston-North Charleston-Summerville Metropolitan Statistical Area as designated for statistical purposes by the U.S. Office...

 to U.S. 17-Alt.

Major Intersections

in North Charleston

North Charleston, South Carolina

North Charleston is the 3rd largest city in the U.S. state of South Carolina with incorporated areas in Berkeley, Charleston, and Dorchester counties. On June 12, 1972 the city of North Charleston incorporated and was the 9th largest city in South Carolina. According to the 2010 Census, North...

 in North Charleston

North Charleston, South Carolina

North Charleston is the 3rd largest city in the U.S. state of South Carolina with incorporated areas in Berkeley, Charleston, and Dorchester counties. On June 12, 1972 the city of North Charleston incorporated and was the 9th largest city in South Carolina. According to the 2010 Census, North...

 in North Charleston

North Charleston, South Carolina

North Charleston is the 3rd largest city in the U.S. state of South Carolina with incorporated areas in Berkeley, Charleston, and Dorchester counties. On June 12, 1972 the city of North Charleston incorporated and was the 9th largest city in South Carolina. According to the 2010 Census, North...

 near Summerville

Summerville, South Carolina

Summerville is a town in the U.S. state of South Carolina situated mostly in Dorchester County with small portions in Berkeley, and Charleston counties. It is part of the Charleston-North Charleston-Summerville Metropolitan Statistical Area as designated for statistical purposes by the U.S. Office...

 near Summerville

Summerville, South Carolina

Summerville is a town in the U.S. state of South Carolina situated mostly in Dorchester County with small portions in Berkeley, and Charleston counties. It is part of the Charleston-North Charleston-Summerville Metropolitan Statistical Area as designated for statistical purposes by the U.S. Office...