Most total collisions occurred on secondary routes in South Carolina (43,179 reported), one of the highest in the United States. Most traffic fatalities in SC occur on rural roads and secondary (including county and state secondary) roads, not primarily on major interstates or urban highways.
This pattern holds for recent years, including the high totals in 2025 (around 946 deaths) and the partial 2026 data through early June (at least 363 deaths). State data and trends consistently show this distribution.
Key Data on Road Types Rural roads:
These account for a disproportionately high share of fatalities. In 2017, nearly 60% of deadly crashes occurred on rural roads. In 2023 (latest detailed IIHS data), it was 53% rural (556 of 1,047 deaths) vs. 47% urban.
South Carolina has long had one of the highest rural road fatality rates in the U.S.
Secondary and county roads:
In 2021, most total collisions occurred on secondary routes (43,179 reported). County roads saw 47 fatal crashes and 176 serious injury crashes that year. Many rural roads fall into these categories.
State-maintained roads overall:
Rural roads make up a small portion of the total roadway network but see far more severe outcomes due to factors like higher speeds, curves, limited shoulders, wildlife, and less frequent enforcement or lighting.