Beginning in the 1750s, the Royal Colony of South Carolina began constructing many new internal roads to connect all of the growing towns within its interior. Thanks to a colony-wide referendum that was launched several years earlier, the Crown ordered the construction of major north-south routes to connect the southern-most colony, Georgia, with the rest of its holdings further north.

The first of these was the King's Highway, which had started in the 1670s between Boston and New York, it was finally constructed along the coast of South Carolina between 1732 and 1735, completed two years after Georgia was founded.

The Great Wagon Road had commenced construction in the 1720s in Pennsylvania, but a treaty was needed with the Native Americans to extend it, and this was acquired in 1744. By 1750, the Great Wagon Road reached into northern South Carolina, but it was not completed to Augusta, Georgia until around 1763.

The Fall Line Road and the Upper Road were built in the 1740s in Virginia and North Carolina, and these two important roads were extended into South Carolina by the late 1750s.

As the colony continued to expand further westward during the "great migration" of the 1740s and 1750s, the Royal governors finally got off their butts and decided to start building some decent interior roads of their own to connect the burgeoning towns with these new major thoroughfares that were launched by the Crown.

Not all of the roads shown below were fully completed by the start of the American Revolution, but some were, and all were "in work" before the end of the Royal Period.