South Carolina Highway 642
State highway in South Carolina, United States
From Wikipedia, the free encyclopedia
South Carolina Highway 642 (SC 642, also known as Dorchester Road), is a 19.292-mile (31.047 km) state highway in the southeastern part of the U.S. state of South Carolina. It travels within the Summerville and North Charleston areas.
US 17 Alt. near Summerville
I-526 in North Charleston
I-26 in North Charleston
South Carolina Highway 642 | ||||
|---|---|---|---|---|
| Dorchester Road | ||||
 | ||||
| Route information | ||||
| Maintained by SCDOT | ||||
| Length | 19.292 mi[1][2] (31.047 km) | |||
| Existed | 1939[citation needed]–present | |||
| Major junctions | ||||
| West end | US 17 Alt. near Summerville | |||
| ||||
| East end |   US 52 / US 78 in North Charleston | |||
| Location | ||||
| Country | United States | |||
| State | South Carolina | |||
| Counties | Dorchester, Charleston | |||
| Highway system | ||||
| ||||
Route description
SR 642 runs for 19.3 miles (31.1 km) from U.S. Route 17 Alternate (US 17 Alt.) southwest of Summerville to US 52/US 78 in North Charleston.[3] Dorchester Road is a heavily congested highway during morning and evening traffic periods.[citation needed]
History
Current plans call for widening of the road from Summerville to US 52/US 78 Alternate. This has been not been completed and will widen the road to a total of 6 lanes with some turning lanes.[4]
Major intersections
| County | Location | mi[1][2] | km | Destinations | Notes |
|---|---|---|---|---|---|
| Dorchester | | 0.000 | 0.000 | US 17 Alt. (US 17 Alt. Truck begins) – Walterboro, Bamberg, Summerville | Western end of US 17 Alt. Truck concurrency; western terminus of SC 642; southern terminus of US 17 Alt. Truck |
| | 2.832 | 4.558 |  SC 165 (Bacons Bridge Road / US 17 Alt. Truck north) – Summerville, Charleston | Eastern end of US 17 Alt. Truck concurrency | |
| Charleston | North Charleston | 16.542– 16.602 | 26.622– 26.718 |  I-526 (Mark Clark Expressway) – Mt. Pleasant, West Ashley, SC | I-526 exit 15 |
| 18.602 | 29.937 |  I-26 – Columbia, Charleston | I-26 exit 215 | ||
| 19.292 | 31.047 | US 52 / US 78 (Rivers Avenue) | Eastern terminus | ||
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | |||||
