The Department of Public Works maintains all roadway networks and bridges owned by the county, as well as constructing an average of 8 miles of paved road each year. Currently, this includes 1428 miles of roadways and 72 bridges. There are 739 miles of paved roads ranging from arterial roads such as Carolina Forest Boulevard which carries over 24,000 trips per day to local access roads in neighborhoods and rural areas. There are also 688 of miles of unpaved roads which include roads improved with marine limestone surfaces and also natural earth surfaces.
From 1999 to 2011 Horry County has accepted ownership and maintenance, typically through land development, of approximately 20 miles (average) of new roads each year. Also, unpaved roads are being improved and paved through the local road plan and the local option sales tax road plan known as Riding on a Penny. These two plans will combine to pave between 150 and 200 miles of existing unpaved roads between 2007 and 2014.